f(-4)=3(-4)+20

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Solution for f(-4)=3(-4)+20 equation: 



f(-4)=3(-4)+20

We move all terms to the left:

f(-4)-(3(-4)+20)=0

We add all the numbers together, and all the variables

f(-4)-8=0

We multiply parentheses

-4f-8=0

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

-4f=8

f=8/-4

f=-2

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