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f(-4)=-4+6
We move all terms to the left:
f(-4)-(-4+6)=0
We add all the numbers together, and all the variables
f(-4)-2=0
We multiply parentheses
-4f-2=0
We move all terms containing f to the left, all other terms to the right
-4f=2
f=2/-4
f=-1/2
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