f(-20)=1+8

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Solution for f(-20)=1+8 equation: 



f(-20)=1+8

We move all terms to the left:

f(-20)-(1+8)=0

We add all the numbers together, and all the variables

f(-20)-9=0

We multiply parentheses

-20f-9=0

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

-20f=9

f=9/-20

f=-9/20

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