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(5x-17)+(2x+23)=90
We move all terms to the left:
(5x-17)+(2x+23)-(90)=0
We get rid of parentheses
5x+2x-17+23-90=0
We add all the numbers together, and all the variables
7x-84=0
We move all terms containing x to the left, all other terms to the right
7x=84
x=84/7
x=12
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