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-20+11u=-16+13u
We move all terms to the left:
-20+11u-(-16+13u)=0
We add all the numbers together, and all the variables
11u-(13u-16)-20=0
We get rid of parentheses
11u-13u+16-20=0
We add all the numbers together, and all the variables
-2u-4=0
We move all terms containing u to the left, all other terms to the right
-2u=4
u=4/-2
u=-2
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