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15=u/3+11
We move all terms to the left:
15-(u/3+11)=0
We get rid of parentheses
-u/3-11+15=0
We multiply all the terms by the denominator
-u-11*3+15*3=0
We add all the numbers together, and all the variables
-1u+12=0
We move all terms containing u to the left, all other terms to the right
-u=-12
u=-12/-1
u=+12
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