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90=2x+18
We move all terms to the left:
90-(2x+18)=0
We get rid of parentheses
-2x-18+90=0
We add all the numbers together, and all the variables
-2x+72=0
We move all terms containing x to the left, all other terms to the right
-2x=-72
x=-72/-2
x=+36
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