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87=5u+17
We move all terms to the left:
87-(5u+17)=0
We get rid of parentheses
-5u-17+87=0
We add all the numbers together, and all the variables
-5u+70=0
We move all terms containing u to the left, all other terms to the right
-5u=-70
u=-70/-5
u=+14
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