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17=u/3-15
We move all terms to the left:
17-(u/3-15)=0
We get rid of parentheses
-u/3+15+17=0
We multiply all the terms by the denominator
-u+15*3+17*3=0
We add all the numbers together, and all the variables
-1u+96=0
We move all terms containing u to the left, all other terms to the right
-u=-96
u=-96/-1
u=+96
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