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12x-18=4x+12
We move all terms to the left:
12x-18-(4x+12)=0
We get rid of parentheses
12x-4x-12-18=0
We add all the numbers together, and all the variables
8x-30=0
We move all terms containing x to the left, all other terms to the right
8x=30
x=30/8
x=3+3/4
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