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-12=6(x+9)
We move all terms to the left:
-12-(6(x+9))=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)
-6x-54-12=0
We add all the numbers together, and all the variables
-6x-66=0
We move all terms containing x to the left, all other terms to the right
-6x=66
x=66/-6
x=-11
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