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90=3x+3+5x-9
We move all terms to the left:
90-(3x+3+5x-9)=0
We add all the numbers together, and all the variables
-(8x-6)+90=0
We get rid of parentheses
-8x+6+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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