-28=f(-4)

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Solution for -28=f(-4) equation: 



-28=f(-4)

We move all terms to the left:

-28-(f(-4))=0



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

f(-4)

We multiply parentheses

-4f

Back to the equation:

-(-4f)



We get rid of parentheses

4f-28=0

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

4f=28

f=28/4

f=7

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