13=f/4-9

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Solution for 13=f/4-9 equation: 



13=f/4-9

We move all terms to the left:

13-(f/4-9)=0

We get rid of parentheses

-f/4+9+13=0

We multiply all the terms by the denominator


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

We add all the numbers together, and all the variables

-1f+88=0

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

-f=-88

f=-88/-1

f=+88

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