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(3x+15)+(2x-15)=90
We move all terms to the left:
(3x+15)+(2x-15)-(90)=0
We get rid of parentheses
3x+2x+15-15-90=0
We add all the numbers together, and all the variables
5x-90=0
We move all terms containing x to the left, all other terms to the right
5x=90
x=90/5
x=18
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