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(11x+2)+(8x+7)=90
We move all terms to the left:
(11x+2)+(8x+7)-(90)=0
We get rid of parentheses
11x+8x+2+7-90=0
We add all the numbers together, and all the variables
19x-81=0
We move all terms containing x to the left, all other terms to the right
19x=81
x=81/19
x=4+5/19
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