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f(-1)=4(-1)+6
We move all terms to the left:
f(-1)-(4(-1)+6)=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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