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(11+2x)+(6x-9)=90
We move all terms to the left:
(11+2x)+(6x-9)-(90)=0
We add all the numbers together, and all the variables
(2x+11)+(6x-9)-90=0
We get rid of parentheses
2x+6x+11-9-90=0
We add all the numbers together, and all the variables
8x-88=0
We move all terms containing x to the left, all other terms to the right
8x=88
x=88/8
x=11
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