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120=12x+13
We move all terms to the left:
120-(12x+13)=0
We get rid of parentheses
-12x-13+120=0
We add all the numbers together, and all the variables
-12x+107=0
We move all terms containing x to the left, all other terms to the right
-12x=-107
x=-107/-12
x=8+11/12
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