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(2x-12)+(5x-9)+(6x-2)=90
We move all terms to the left:
(2x-12)+(5x-9)+(6x-2)-(90)=0
We get rid of parentheses
2x+5x+6x-12-9-2-90=0
We add all the numbers together, and all the variables
13x-113=0
We move all terms containing x to the left, all other terms to the right
13x=113
x=113/13
x=8+9/13
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