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100=5u+15
We move all terms to the left:
100-(5u+15)=0
We get rid of parentheses
-5u-15+100=0
We add all the numbers together, and all the variables
-5u+85=0
We move all terms containing u to the left, all other terms to the right
-5u=-85
u=-85/-5
u=+17
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