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39=5x+4(-x+12)
We move all terms to the left:
39-(5x+4(-x+12))=0
We add all the numbers together, and all the variables
-(5x+4(-1x+12))+39=0
We calculate terms in parentheses: -(5x+4(-1x+12)), so:We get rid of parentheses
5x+4(-1x+12)
We multiply parentheses
5x-4x+48
We add all the numbers together, and all the variables
x+48
Back to the equation:
-(x+48)
-x-48+39=0
We add all the numbers together, and all the variables
-1x-9=0
We move all terms containing x to the left, all other terms to the right
-x=9
x=9/-1
x=-9
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