3x-(-7x+7)=-87.

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Solution for 3x-(-7x+7)=-87. equation: 



3x-(-7x+7)=-87.

We move all terms to the left:

3x-(-7x+7)-(-87.)=0

We add all the numbers together, and all the variables

3x-(-7x+7)-(-87)=0

We add all the numbers together, and all the variables

3x-(-7x+7)+87=0

We get rid of parentheses

3x+7x-7+87=0

We add all the numbers together, and all the variables

10x+80=0

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

10x=-80

x=-80/10

x=-8

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