f(-1)=9-6(-1)

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Solution for f(-1)=9-6(-1) equation: 



f(-1)=9-6(-1)

We move all terms to the left:

f(-1)-(9-6(-1))=0

We add all the numbers together, and all the variables

f(-1)-15=0

We multiply parentheses

-1f-15=0

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

-f=15

f=15/-1

f=-15

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