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11+15u=-17+13u
We move all terms to the left:
11+15u-(-17+13u)=0
We add all the numbers together, and all the variables
15u-(13u-17)+11=0
We get rid of parentheses
15u-13u+17+11=0
We add all the numbers together, and all the variables
2u+28=0
We move all terms containing u to the left, all other terms to the right
2u=-28
u=-28/2
u=-14
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