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u-11=9-3u
We move all terms to the left:
u-11-(9-3u)=0
We add all the numbers together, and all the variables
u-(-3u+9)-11=0
We get rid of parentheses
u+3u-9-11=0
We add all the numbers together, and all the variables
4u-20=0
We move all terms containing u to the left, all other terms to the right
4u=20
u=20/4
u=5
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