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(3x-7)+(2x+2)=90
We move all terms to the left:
(3x-7)+(2x+2)-(90)=0
We get rid of parentheses
3x+2x-7+2-90=0
We add all the numbers together, and all the variables
5x-95=0
We move all terms containing x to the left, all other terms to the right
5x=95
x=95/5
x=19
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