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11=2-9u
We move all terms to the left:
11-(2-9u)=0
We add all the numbers together, and all the variables
-(-9u+2)+11=0
We get rid of parentheses
9u-2+11=0
We add all the numbers together, and all the variables
9u+9=0
We move all terms containing u to the left, all other terms to the right
9u=-9
u=-9/9
u=-1
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