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39=3(x+4)
We move all terms to the left:
39-(3(x+4))=0
We calculate terms in parentheses: -(3(x+4)), so:We get rid of parentheses
3(x+4)
We multiply parentheses
3x+12
Back to the equation:
-(3x+12)
-3x-12+39=0
We add all the numbers together, and all the variables
-3x+27=0
We move all terms containing x to the left, all other terms to the right
-3x=-27
x=-27/-3
x=+9
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