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(13x+12)=129
We move all terms to the left:
(13x+12)-(129)=0
We get rid of parentheses
13x+12-129=0
We add all the numbers together, and all the variables
13x-117=0
We move all terms containing x to the left, all other terms to the right
13x=117
x=117/13
x=9
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