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(11x-12)+(3x+18)=90
We move all terms to the left:
(11x-12)+(3x+18)-(90)=0
We get rid of parentheses
11x+3x-12+18-90=0
We add all the numbers together, and all the variables
14x-84=0
We move all terms containing x to the left, all other terms to the right
14x=84
x=84/14
x=6
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