f(-9)=-81

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Solution for f(-9)=-81 equation: 



f(-9)=-81

We move all terms to the left:

f(-9)-(-81)=0

We add all the numbers together, and all the variables

f(-9)+81=0

We multiply parentheses

-9f+81=0

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

-9f=-81

f=-81/-9

f=+9

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