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120=39x+3
We move all terms to the left:
120-(39x+3)=0
We get rid of parentheses
-39x-3+120=0
We add all the numbers together, and all the variables
-39x+117=0
We move all terms containing x to the left, all other terms to the right
-39x=-117
x=-117/-39
x=+3
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