13=u/9+4

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Solution for 13=u/9+4 equation: 



13=u/9+4

We move all terms to the left:

13-(u/9+4)=0

We get rid of parentheses

-u/9-4+13=0

We multiply all the terms by the denominator


-u-4*9+13*9=0

We add all the numbers together, and all the variables

-1u+81=0

We move all terms containing u to the left, all other terms to the right

-u=-81

u=-81/-1

u=+81

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