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(x+9)+(2x-41)=90
We move all terms to the left:
(x+9)+(2x-41)-(90)=0
We get rid of parentheses
x+2x+9-41-90=0
We add all the numbers together, and all the variables
3x-122=0
We move all terms containing x to the left, all other terms to the right
3x=122
x=122/3
x=40+2/3
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