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f(-1)=-2-3
We move all terms to the left:
f(-1)-(-2-3)=0
We add all the numbers together, and all the variables
f(-1)-(-5)=0
We add all the numbers together, and all the variables
f(-1)+5=0
We multiply parentheses
-1f+5=0
We move all terms containing f to the left, all other terms to the right
-f=-5
f=-5/-1
f=+5
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