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9+10u=3+9u
We move all terms to the left:
9+10u-(3+9u)=0
We add all the numbers together, and all the variables
10u-(9u+3)+9=0
We get rid of parentheses
10u-9u-3+9=0
We add all the numbers together, and all the variables
u+6=0
We move all terms containing u to the left, all other terms to the right
u=-6
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