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

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



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

We move all terms to the left:

f(-4)-((-4)*2-(-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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