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(x+15)+(x-7)=90
We move all terms to the left:
(x+15)+(x-7)-(90)=0
We get rid of parentheses
x+x+15-7-90=0
We add all the numbers together, and all the variables
2x-82=0
We move all terms containing x to the left, all other terms to the right
2x=82
x=82/2
x=41
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