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39=3(4x+9)
We move all terms to the left:
39-(3(4x+9))=0
We calculate terms in parentheses: -(3(4x+9)), so:We get rid of parentheses
3(4x+9)
We multiply parentheses
12x+27
Back to the equation:
-(12x+27)
-12x-27+39=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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