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