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18x-18=3x+12
We move all terms to the left:
18x-18-(3x+12)=0
We get rid of parentheses
18x-3x-12-18=0
We add all the numbers together, and all the variables
15x-30=0
We move all terms containing x to the left, all other terms to the right
15x=30
x=30/15
x=2
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