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(5x+17)+(3x-15)=90
We move all terms to the left:
(5x+17)+(3x-15)-(90)=0
We get rid of parentheses
5x+3x+17-15-90=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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