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(5x+7)+(8x-20)=90
We move all terms to the left:
(5x+7)+(8x-20)-(90)=0
We get rid of parentheses
5x+8x+7-20-90=0
We add all the numbers together, and all the variables
13x-103=0
We move all terms containing x to the left, all other terms to the right
13x=103
x=103/13
x=7+12/13
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