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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 get rid of parentheses
3x+7x+7+87=0
We add all the numbers together, and all the variables
10x+94=0
We move all terms containing x to the left, all other terms to the right
10x=-94
x=-94/10
x=-9+2/5
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