f(-1)=-1(9)(-1)

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Solution for f(-1)=-1(9)(-1) equation: 



f(-1)=-1(9)(-1)

We move all terms to the left:

f(-1)-(-1(9)(-1))=0

We add all the numbers together, and all the variables

f(-1)-19=0

We multiply parentheses

-1f-19=0

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

-f=19

f=19/-1

f=-19

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