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12=12x-18
We move all terms to the left:
12-(12x-18)=0
We get rid of parentheses
-12x+18+12=0
We add all the numbers together, and all the variables
-12x+30=0
We move all terms containing x to the left, all other terms to the right
-12x=-30
x=-30/-12
x=2+1/2
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