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u-11=2u-39
We move all terms to the left:
u-11-(2u-39)=0
We get rid of parentheses
u-2u+39-11=0
We add all the numbers together, and all the variables
-1u+28=0
We move all terms containing u to the left, all other terms to the right
-u=-28
u=-28/-1
u=+28
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