15=4f-f

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Solution for 15=4f-f equation: 



15=4f-f

We move all terms to the left:

15-(4f-f)=0

We add all the numbers together, and all the variables

-(+3f)+15=0

We get rid of parentheses

-3f+15=0

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

-3f=-15

f=-15/-3

f=+5

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