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(8x+2)+(7x+17)=90
We move all terms to the left:
(8x+2)+(7x+17)-(90)=0
We get rid of parentheses
8x+7x+2+17-90=0
We add all the numbers together, and all the variables
15x-71=0
We move all terms containing x to the left, all other terms to the right
15x=71
x=71/15
x=4+11/15
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