f(-1)=9-4

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Solution for f(-1)=9-4 equation: 



f(-1)=9-4

We move all terms to the left:

f(-1)-(9-4)=0

We add all the numbers together, and all the variables

f(-1)-5=0

We multiply parentheses

-1f-5=0

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

-f=5

f=5/-1

f=-5

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