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(7x-17)+(5x+1)=90
We move all terms to the left:
(7x-17)+(5x+1)-(90)=0
We get rid of parentheses
7x+5x-17+1-90=0
We add all the numbers together, and all the variables
12x-106=0
We move all terms containing x to the left, all other terms to the right
12x=106
x=106/12
x=8+5/6
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