-3(x+7)+15=42+x

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Solution for -3(x+7)+15=42+x equation: 



-3(x+7)+15=42+x

We move all terms to the left:

-3(x+7)+15-(42+x)=0

We add all the numbers together, and all the variables

-3(x+7)-(x+42)+15=0

We multiply parentheses

-3x-(x+42)-21+15=0

We get rid of parentheses

-3x-x-42-21+15=0

We add all the numbers together, and all the variables

-4x-48=0

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

-4x=48

x=48/-4

x=-12

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