f(-4)=9

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Solution for f(-4)=9 equation: 



f(-4)=9

We move all terms to the left:

f(-4)-(9)=0

We multiply parentheses

-4f-9=0

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

-4f=9

f=9/-4

f=-2+1/4

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