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(3x-9)+(x+3)=90
We move all terms to the left:
(3x-9)+(x+3)-(90)=0
We get rid of parentheses
3x+x-9+3-90=0
We add all the numbers together, and all the variables
4x-96=0
We move all terms containing x to the left, all other terms to the right
4x=96
x=96/4
x=24
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