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7=u/4-15
We move all terms to the left:
7-(u/4-15)=0
We get rid of parentheses
-u/4+15+7=0
We multiply all the terms by the denominator
-u+15*4+7*4=0
We add all the numbers together, and all the variables
-1u+88=0
We move all terms containing u to the left, all other terms to the right
-u=-88
u=-88/-1
u=+88
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