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16=u/3+9
We move all terms to the left:
16-(u/3+9)=0
We get rid of parentheses
-u/3-9+16=0
We multiply all the terms by the denominator
-u-9*3+16*3=0
We add all the numbers together, and all the variables
-1u+21=0
We move all terms containing u to the left, all other terms to the right
-u=-21
u=-21/-1
u=+21
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