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12=20x+18
We move all terms to the left:
12-(20x+18)=0
We get rid of parentheses
-20x-18+12=0
We add all the numbers together, and all the variables
-20x-6=0
We move all terms containing x to the left, all other terms to the right
-20x=6
x=6/-20
x=-3/10
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