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-3=-9+u/6
We move all terms to the left:
-3-(-9+u/6)=0
We add all the numbers together, and all the variables
-(u/6-9)-3=0
We get rid of parentheses
-u/6+9-3=0
We multiply all the terms by the denominator
-u+9*6-3*6=0
We add all the numbers together, and all the variables
-1u+36=0
We move all terms containing u to the left, all other terms to the right
-u=-36
u=-36/-1
u=+36
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