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(12x+1)=90
We move all terms to the left:
(12x+1)-(90)=0
We get rid of parentheses
12x+1-90=0
We add all the numbers together, and all the variables
12x-89=0
We move all terms containing x to the left, all other terms to the right
12x=89
x=89/12
x=7+5/12
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