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18-x=x-12
We move all terms to the left:
18-x-(x-12)=0
We add all the numbers together, and all the variables
-1x-(x-12)+18=0
We get rid of parentheses
-1x-x+12+18=0
We add all the numbers together, and all the variables
-2x+30=0
We move all terms containing x to the left, all other terms to the right
-2x=-30
x=-30/-2
x=+15
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