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(3x+3)+(5x-9)=90
We move all terms to the left:
(3x+3)+(5x-9)-(90)=0
We get rid of parentheses
3x+5x+3-9-90=0
We add all the numbers together, and all the variables
8x-96=0
We move all terms containing x to the left, all other terms to the right
8x=96
x=96/8
x=12
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