f(-1)=-2+4

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Solution for f(-1)=-2+4 equation: 



f(-1)=-2+4

We move all terms to the left:

f(-1)-(-2+4)=0

We add all the numbers together, and all the variables

f(-1)-2=0

We multiply parentheses

-1f-2=0

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

-f=2

f=2/-1

f=-2

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