15f=-5(-f-4)

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Solution for 15f=-5(-f-4) equation: 



15f=-5(-f-4)

We move all terms to the left:

15f-(-5(-f-4))=0

We add all the numbers together, and all the variables

15f-(-5(-1f-4))=0



We calculate terms in parentheses: -(-5(-1f-4)), so:

-5(-1f-4)

We multiply parentheses

5f+20

Back to the equation:

-(5f+20)



We get rid of parentheses

15f-5f-20=0

We add all the numbers together, and all the variables

10f-20=0

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

10f=20

f=20/10

f=2

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