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12u=9u+9
We move all terms to the left:
12u-(9u+9)=0
We get rid of parentheses
12u-9u-9=0
We add all the numbers together, and all the variables
3u-9=0
We move all terms containing u to the left, all other terms to the right
3u=9
u=9/3
u=3
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