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10u=9+9u
We move all terms to the left:
10u-(9+9u)=0
We add all the numbers together, and all the variables
10u-(9u+9)=0
We get rid of parentheses
10u-9u-9=0
We add all the numbers together, and all the variables
u-9=0
We move all terms containing u to the left, all other terms to the right
u=9
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