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18=12x+6x
We move all terms to the left:
18-(12x+6x)=0
We add all the numbers together, and all the variables
-(+18x)+18=0
We get rid of parentheses
-18x+18=0
We move all terms containing x to the left, all other terms to the right
-18x=-18
x=-18/-18
x=1
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