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90=6x+18
We move all terms to the left:
90-(6x+18)=0
We get rid of parentheses
-6x-18+90=0
We add all the numbers together, and all the variables
-6x+72=0
We move all terms containing x to the left, all other terms to the right
-6x=-72
x=-72/-6
x=+12
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