f(-2)=-2-1

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Solution for f(-2)=-2-1 equation: 



f(-2)=-2-1

We move all terms to the left:

f(-2)-(-2-1)=0

We add all the numbers together, and all the variables

f(-2)-(-3)=0

We add all the numbers together, and all the variables

f(-2)+3=0

We multiply parentheses

-2f+3=0

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

-2f=-3

f=-3/-2

f=1+1/2

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