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13=u/9
We move all terms to the left:
13-(u/9)=0
We add all the numbers together, and all the variables
-(+u/9)+13=0
We get rid of parentheses
-u/9+13=0
We multiply all the terms by the denominator
-u+13*9=0
We add all the numbers together, and all the variables
-1u+117=0
We move all terms containing u to the left, all other terms to the right
-u=-117
u=-117/-1
u=+117
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