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9(x-8)=7(x+12)
We move all terms to the left:
9(x-8)-(7(x+12))=0
We multiply parentheses
9x-(7(x+12))-72=0
We calculate terms in parentheses: -(7(x+12)), so:We get rid of parentheses
7(x+12)
We multiply parentheses
7x+84
Back to the equation:
-(7x+84)
9x-7x-84-72=0
We add all the numbers together, and all the variables
2x-156=0
We move all terms containing x to the left, all other terms to the right
2x=156
x=156/2
x=78
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