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15=u/4-12
We move all terms to the left:
15-(u/4-12)=0
We get rid of parentheses
-u/4+12+15=0
We multiply all the terms by the denominator
-u+12*4+15*4=0
We add all the numbers together, and all the variables
-1u+108=0
We move all terms containing u to the left, all other terms to the right
-u=-108
u=-108/-1
u=+108
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