f(-2)=-2-4=-6

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Solution for f(-2)=-2-4=-6 equation: 



f(-2)=-2-4=-6

We move all terms to the left:

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

We add all the numbers together, and all the variables

f(-2)-(-6)=0

We add all the numbers together, and all the variables

f(-2)+6=0

We multiply parentheses

-2f+6=0

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

-2f=-6

f=-6/-2

f=+3

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