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18=5u+12
We move all terms to the left:
18-(5u+12)=0
We get rid of parentheses
-5u-12+18=0
We add all the numbers together, and all the variables
-5u+6=0
We move all terms containing u to the left, all other terms to the right
-5u=-6
u=-6/-5
u=1+1/5
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