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(2x+15)+(3x-20)=90
We move all terms to the left:
(2x+15)+(3x-20)-(90)=0
We get rid of parentheses
2x+3x+15-20-90=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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