f(-1)=4-1+17

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Solution for f(-1)=4-1+17 equation: 



f(-1)=4-1+17

We move all terms to the left:

f(-1)-(4-1+17)=0

We add all the numbers together, and all the variables

f(-1)-20=0

We multiply parentheses

-1f-20=0

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

-f=20

f=20/-1

f=-20

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