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f(-2)=6.f(0)=-4
We move all terms to the left:
f(-2)-(6.f(0))=0
We add all the numbers together, and all the variables
f(-2)-(+6.f)=0
We multiply parentheses
-2f-(+6.f)=0
We get rid of parentheses
-2f-6.f=0
We add all the numbers together, and all the variables
-8f=0
f=0/-8
f=0
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