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(x+6)+(2x+1)=90
We move all terms to the left:
(x+6)+(2x+1)-(90)=0
We get rid of parentheses
x+2x+6+1-90=0
We add all the numbers together, and all the variables
3x-83=0
We move all terms containing x to the left, all other terms to the right
3x=83
x=83/3
x=27+2/3
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