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You need to get the variable alone

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to add and subtract to isolate the variable

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you have to add or subtract a problem to get to get an answer with an equal value of the number on the other side of the equal sign.

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to solve one step addition and subtraction equations you get the variable alone be subtracting or adding the number that's being added or subtract be the variable.

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5+d=11=d=6

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To solve, you add or subtract from each side to isolate the variable and to get the answer.
ex x+3=7 4+3=7

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in 1+v=12 v=13

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When you add or subract

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Look at the number being added or subtracted by the variable. Subtract or add the number being added or subtracted to the answer. Examples:  x + 15 = 25 x = 10
x - 15 = 10 x= 5

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The number that get added by a varible

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you add or subtract each side to get an equal answer
example: 1+d=71 1+70=71

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You have to get the variable all by it's self on one side so you have to add or subtract BOTH numbers because you have to do it to each side.

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you add and subtract the unknown to get he answer
ex 8+x=10

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when adding or subtracting one step equations you must subtract the number on the side of the x, then subtract the number on the other side by the the number on the side of the x.

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find the variable then find what operation that the problem is do then do the opposite operation to both of the equal sign to solve the problem.
Ex t+7=15    13+7=15

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You subtract or add the the number from the variable and that will be your answer

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You add or subtract the number.

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add or subtract

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You subtract the number from the variable and that will be the unknown Ex. 8 + x = 17 x=

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The number being added by a variable. Then subtract the number from being added by the variable

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The number that gets added by a varible.
EXample: M + 5 = 55    50+5=55

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Number are being added by the variable and subtract the number from the answer and you can find out the variable.

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The number that is being added by the variable, subtract that number from the answer and you will have your unknown. Example: x + 2 = 5 5-2 =3

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Look at the number being added by the variable and look at the answer to the problem. Subtract the answer from the number being added by the variable and u will get your answer/variable.         Example: x + 10 = 15   15 - 10 = 5