13=f/3+9

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Solution for 13=f/3+9 equation: 



13=f/3+9

We move all terms to the left:

13-(f/3+9)=0

We get rid of parentheses

-f/3-9+13=0

We multiply all the terms by the denominator


-f-9*3+13*3=0

We add all the numbers together, and all the variables

-1f+12=0

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

-f=-12

f=-12/-1

f=+12

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