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(5x+12)+(6x-11)=90
We move all terms to the left:
(5x+12)+(6x-11)-(90)=0
We get rid of parentheses
5x+6x+12-11-90=0
We add all the numbers together, and all the variables
11x-89=0
We move all terms containing x to the left, all other terms to the right
11x=89
x=89/11
x=8+1/11
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