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(5x+12)=120
We move all terms to the left:
(5x+12)-(120)=0
We get rid of parentheses
5x+12-120=0
We add all the numbers together, and all the variables
5x-108=0
We move all terms containing x to the left, all other terms to the right
5x=108
x=108/5
x=21+3/5
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