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86=5u+11
We move all terms to the left:
86-(5u+11)=0
We get rid of parentheses
-5u-11+86=0
We add all the numbers together, and all the variables
-5u+75=0
We move all terms containing u to the left, all other terms to the right
-5u=-75
u=-75/-5
u=+15
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