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120=12+4x
We move all terms to the left:
120-(12+4x)=0
We add all the numbers together, and all the variables
-(4x+12)+120=0
We get rid of parentheses
-4x-12+120=0
We add all the numbers together, and all the variables
-4x+108=0
We move all terms containing x to the left, all other terms to the right
-4x=-108
x=-108/-4
x=+27
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