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(6x+1)+(2x+1)=90
We move all terms to the left:
(6x+1)+(2x+1)-(90)=0
We get rid of parentheses
6x+2x+1+1-90=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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