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f(-2)=-2.f(0)=2
We move all terms to the left:
f(-2)-(-2.f(0))=0
We add all the numbers together, and all the variables
f(-2)-(-2f)=0
We multiply parentheses
-2f-(-2f)=0
We get rid of parentheses
-2f+2f=0
We add all the numbers together, and all the variables
=0
f=0/1
f=0
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