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85=5x-5(7x+7)
We move all terms to the left:
85-(5x-5(7x+7))=0
We calculate terms in parentheses: -(5x-5(7x+7)), so:We get rid of parentheses
5x-5(7x+7)
We multiply parentheses
5x-35x-35
We add all the numbers together, and all the variables
-30x-35
Back to the equation:
-(-30x-35)
30x+35+85=0
We add all the numbers together, and all the variables
30x+120=0
We move all terms containing x to the left, all other terms to the right
30x=-120
x=-120/30
x=-4
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