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