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15=u/4+3
We move all terms to the left:
15-(u/4+3)=0
We get rid of parentheses
-u/4-3+15=0
We multiply all the terms by the denominator
-u-3*4+15*4=0
We add all the numbers together, and all the variables
-1u+48=0
We move all terms containing u to the left, all other terms to the right
-u=-48
u=-48/-1
u=+48
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