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90=4x-6+2x+6
We move all terms to the left:
90-(4x-6+2x+6)=0
We add all the numbers together, and all the variables
-(+6x)+90=0
We get rid of parentheses
-6x+90=0
We move all terms containing x to the left, all other terms to the right
-6x=-90
x=-90/-6
x=+15
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