15=-f-4f

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Solution for 15=-f-4f equation: 



15=-f-4f

We move all terms to the left:

15-(-f-4f)=0

We add all the numbers together, and all the variables

-(-5f)+15=0

We get rid of parentheses

5f+15=0

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

5f=-15

f=-15/5

f=-3

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