15=9+3f

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Solution for 15=9+3f equation: 



15=9+3f

We move all terms to the left:

15-(9+3f)=0

We add all the numbers together, and all the variables

-(3f+9)+15=0

We get rid of parentheses

-3f-9+15=0

We add all the numbers together, and all the variables

-3f+6=0

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

-3f=-6

f=-6/-3

f=+2

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