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9=u/3-8
We move all terms to the left:
9-(u/3-8)=0
We get rid of parentheses
-u/3+8+9=0
We multiply all the terms by the denominator
-u+8*3+9*3=0
We add all the numbers together, and all the variables
-1u+51=0
We move all terms containing u to the left, all other terms to the right
-u=-51
u=-51/-1
u=+51
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