7x+15=42-2x

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Solution for 7x+15=42-2x equation: 



7x+15=42-2x

We move all terms to the left:

7x+15-(42-2x)=0

We add all the numbers together, and all the variables

7x-(-2x+42)+15=0

We get rid of parentheses

7x+2x-42+15=0

We add all the numbers together, and all the variables

9x-27=0

We move all terms containing x to the left, all other terms to the right

9x=27

x=27/9

x=3

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