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9(x-12)=6(x+9)
We move all terms to the left:
9(x-12)-(6(x+9))=0
We multiply parentheses
9x-(6(x+9))-108=0
We calculate terms in parentheses: -(6(x+9)), so:We get rid of parentheses
6(x+9)
We multiply parentheses
6x+54
Back to the equation:
-(6x+54)
9x-6x-54-108=0
We add all the numbers together, and all the variables
3x-162=0
We move all terms containing x to the left, all other terms to the right
3x=162
x=162/3
x=54
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