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f(-3)=9-6(-3)
We move all terms to the left:
f(-3)-(9-6(-3))=0
We add all the numbers together, and all the variables
f(-3)-27=0
We multiply parentheses
-3f-27=0
We move all terms containing f to the left, all other terms to the right
-3f=27
f=27/-3
f=-9
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