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f(-3)=9-3(-3)
We move all terms to the left:
f(-3)-(9-3(-3))=0
We add all the numbers together, and all the variables
f(-3)-18=0
We multiply parentheses
-3f-18=0
We move all terms containing f to the left, all other terms to the right
-3f=18
f=18/-3
f=-6
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