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f(-4)=-(-4)-1
We move all terms to the left:
f(-4)-(-(-4)-1)=0
We add all the numbers together, and all the variables
f(-4)-3=0
We multiply parentheses
-4f-3=0
We move all terms containing f to the left, all other terms to the right
-4f=3
f=3/-4
f=-3/4
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