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18=2x+12
We move all terms to the left:
18-(2x+12)=0
We get rid of parentheses
-2x-12+18=0
We add all the numbers together, and all the variables
-2x+6=0
We move all terms containing x to the left, all other terms to the right
-2x=-6
x=-6/-2
x=+3
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