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120=18x+12
We move all terms to the left:
120-(18x+12)=0
We get rid of parentheses
-18x-12+120=0
We add all the numbers together, and all the variables
-18x+108=0
We move all terms containing x to the left, all other terms to the right
-18x=-108
x=-108/-18
x=+6
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