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-7(-x-1)=5(-x-1)
We move all terms to the left:
-7(-x-1)-(5(-x-1))=0
We add all the numbers together, and all the variables
-7(-1x-1)-(5(-1x-1))=0
We multiply parentheses
7x-(5(-1x-1))+7=0
We calculate terms in parentheses: -(5(-1x-1)), so:We get rid of parentheses
5(-1x-1)
We multiply parentheses
-5x-5
Back to the equation:
-(-5x-5)
7x+5x+5+7=0
We add all the numbers together, and all the variables
12x+12=0
We move all terms containing x to the left, all other terms to the right
12x=-12
x=-12/12
x=-1
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