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5=u/3-9
We move all terms to the left:
5-(u/3-9)=0
We get rid of parentheses
-u/3+9+5=0
We multiply all the terms by the denominator
-u+9*3+5*3=0
We add all the numbers together, and all the variables
-1u+42=0
We move all terms containing u to the left, all other terms to the right
-u=-42
u=-42/-1
u=+42
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