f(-4)=-2(-4)-4

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Solution for f(-4)=-2(-4)-4 equation: 



f(-4)=-2(-4)-4

We move all terms to the left:

f(-4)-(-2(-4)-4)=0

We add all the numbers together, and all the variables

f(-4)-4=0

We multiply parentheses

-4f-4=0

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

-4f=4

f=4/-4

f=-1

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