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12=24x+12.x
We move all terms to the left:
12-(24x+12.x)=0
We add all the numbers together, and all the variables
-(+36x)+12=0
We get rid of parentheses
-36x+12=0
We move all terms containing x to the left, all other terms to the right
-36x=-12
x=-12/-36
x=1/3
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