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-7(-x-1)=9(x-3)
We move all terms to the left:
-7(-x-1)-(9(x-3))=0
We add all the numbers together, and all the variables
-7(-1x-1)-(9(x-3))=0
We multiply parentheses
7x-(9(x-3))+7=0
We calculate terms in parentheses: -(9(x-3)), so:We get rid of parentheses
9(x-3)
We multiply parentheses
9x-27
Back to the equation:
-(9x-27)
7x-9x+27+7=0
We add all the numbers together, and all the variables
-2x+34=0
We move all terms containing x to the left, all other terms to the right
-2x=-34
x=-34/-2
x=+17
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