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(8x+2)+(7x+13)=90
We move all terms to the left:
(8x+2)+(7x+13)-(90)=0
We get rid of parentheses
8x+7x+2+13-90=0
We add all the numbers together, and all the variables
15x-75=0
We move all terms containing x to the left, all other terms to the right
15x=75
x=75/15
x=5
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