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example 1)      2x+2  x=1   2(1)+2    2+2=4
example 2) 5x+10 x=5 5(5)+10 25+10=35

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Evaluating an expression with one variable

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Learn how to evaluate an expression with variables using a technique called substitution (or "plugging in").

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example 1)   3x+120=2x+20     x+120=20       x=-100
example 2) 4x+1=3x+1,000,001 x=1=1,000,001 x=1,000,000

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Solving Equations With A Variable On Both Sides

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example 1) 3x+35=75    3x=40   x=13.3333333 repeat
example 2) 5x-62=68 5x=130 x=26

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How to solve MULTI-STEP EQUATIONS: THE EASY WAY!

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How to simplify an expression by combining like terms and the distributive property | Khan Academy