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You solve an equation that contains addition by using subtraction.

You solve an equation that contains subtraction by using addition.

This is the inverse operation.

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You can solve an equation that contains addition by subtraction, this is an inverse operation

if you solve an equation that used subtraction and if you use addition to solve it it is also an inverse operation

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you can solve an equation that contain addition by subrtaction

this is the inverse operation

you solve an eqation that contain subrtaction by adition

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You solve an equation that contain addition by subtraction

You solve an equation that contain subtraction by addition
This is the inverse operation.

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you solve an equation that contains addition by using an inverse operation
You solve an equation that contain subtraction by using an inverse operation

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x + 21         =30 - total
-21           -21
x = 9

You solve an equation that contains addition by using the inverse operation and subtracting to undo it.

You solve an equation that contains subtraction by using inverse operation and adding to undo the equation.

This is the inverse operation.

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You solve an equation that contains addition by using subtraction .
Inverse operation

You solve an equation that contains subtraction  by adding  .

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You solve an equation that  contain addition by using subtraction

You solve an equation that contain subtraction by using addition

this is the inverse operation

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You solve an equation that contains addition by using subtraction.
You solve an equation that contains subtraction by using addition.
This operation is inverse operation.

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You solve an equation that contain addition by using subtraction

Inverse operation

You solve an equation that contain subtraction by addition.

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x + 21 = 30

x = 9
you solve an equation that contains addition with subtraction and with subtraction you have to do addition.

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x + 21 = 30

x = 9
you solve an equation that contains addition with subtraction and with subtraction you have to do addition.

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You solve an equation that contains addition by subtracting.

You solve an equation that contains subtraction by adding.

In other words you use the inverse property

Example:
x+21=30
-21   -21       x=9

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x + 21 = 30 Total
-21    -21
x=9
You solve the equation that contains addition by using subtraction.
You solve an equation that contains subtraction by using addition.
This is the inverse operation.

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x + 21 = 30
-21    -21
x    =    9

You need to subtract 21 and 30 to get 9. To make sure that the answer is correct. So x=9

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You solve an equation that contain addition by using subtraction.

You solve an equation that contain subtraction by using addition
inverse operation

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Inverse operation

You solve an equation that contains addition by doing subtraction.

You solve an equation that contains subtraction by doing addition.

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x+21 =30
-21   -21
x=9

is that where there are 2 -21 that canceling it out and making 30 in to 9 so that make x=9

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x + 21 = 30

x = 9
you solve an equation that contains addition with subtraction and with subtraction you have to do addition.

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Inverse Operation

You solve an equation that contains addition by using subtraction.

You solve an equation that contains subtraction  by using addition.