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f(-9)=-27-8
We move all terms to the left:
f(-9)-(-27-8)=0
We add all the numbers together, and all the variables
f(-9)-(-35)=0
We add all the numbers together, and all the variables
f(-9)+35=0
We multiply parentheses
-9f+35=0
We move all terms containing f to the left, all other terms to the right
-9f=-35
f=-35/-9
f=3+8/9
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