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90=4x+6+2x+18
We move all terms to the left:
90-(4x+6+2x+18)=0
We add all the numbers together, and all the variables
-(6x+24)+90=0
We get rid of parentheses
-6x-24+90=0
We add all the numbers together, and all the variables
-6x+66=0
We move all terms containing x to the left, all other terms to the right
-6x=-66
x=-66/-6
x=+11
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