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11=8u+15
We move all terms to the left:
11-(8u+15)=0
We get rid of parentheses
-8u-15+11=0
We add all the numbers together, and all the variables
-8u-4=0
We move all terms containing u to the left, all other terms to the right
-8u=4
u=4/-8
u=-1/2
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