15=9+4f

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Solution for 15=9+4f equation: 



15=9+4f

We move all terms to the left:

15-(9+4f)=0

We add all the numbers together, and all the variables

-(4f+9)+15=0

We get rid of parentheses

-4f-9+15=0

We add all the numbers together, and all the variables

-4f+6=0

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

-4f=-6

f=-6/-4

f=1+1/2

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