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(12x-4)+(10x+10)=90
We move all terms to the left:
(12x-4)+(10x+10)-(90)=0
We get rid of parentheses
12x+10x-4+10-90=0
We add all the numbers together, and all the variables
22x-84=0
We move all terms containing x to the left, all other terms to the right
22x=84
x=84/22
x=3+9/11
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