f(-1)=7-1-5

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Solution for f(-1)=7-1-5 equation: 



f(-1)=7-1-5

We move all terms to the left:

f(-1)-(7-1-5)=0

We add all the numbers together, and all the variables

f(-1)-1=0

We multiply parentheses

-1f-1=0

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

-f=1

f=1/-1

f=-1

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