f(-5)=-21

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Solution for f(-5)=-21 equation: 



f(-5)=-21

We move all terms to the left:

f(-5)-(-21)=0

We add all the numbers together, and all the variables

f(-5)+21=0

We multiply parentheses

-5f+21=0

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

-5f=-21

f=-21/-5

f=4+1/5

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