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(2x+3)+(x-3)=90
We move all terms to the left:
(2x+3)+(x-3)-(90)=0
We get rid of parentheses
2x+x+3-3-90=0
We add all the numbers together, and all the variables
3x-90=0
We move all terms containing x to the left, all other terms to the right
3x=90
x=90/3
x=30
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