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90=3x-4+5x+6
We move all terms to the left:
90-(3x-4+5x+6)=0
We add all the numbers together, and all the variables
-(8x+2)+90=0
We get rid of parentheses
-8x-2+90=0
We add all the numbers together, and all the variables
-8x+88=0
We move all terms containing x to the left, all other terms to the right
-8x=-88
x=-88/-8
x=+11
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