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-9=u/3-10
We move all terms to the left:
-9-(u/3-10)=0
We get rid of parentheses
-u/3+10-9=0
We multiply all the terms by the denominator
-u+10*3-9*3=0
We add all the numbers together, and all the variables
-1u+3=0
We move all terms containing u to the left, all other terms to the right
-u=-3
u=-3/-1
u=+3
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