f(-2)=-2-2

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



f(-2)=-2-2

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

f(-2)+4=0

We multiply parentheses

-2f+4=0

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

-2f=-4

f=-4/-2

f=+2

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