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36=u/4+15
We move all terms to the left:
36-(u/4+15)=0
We get rid of parentheses
-u/4-15+36=0
We multiply all the terms by the denominator
-u-15*4+36*4=0
We add all the numbers together, and all the variables
-1u+84=0
We move all terms containing u to the left, all other terms to the right
-u=-84
u=-84/-1
u=+84
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