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f(-8)=-8-1
We move all terms to the left:
f(-8)-(-8-1)=0
We add all the numbers together, and all the variables
f(-8)-(-9)=0
We add all the numbers together, and all the variables
f(-8)+9=0
We multiply parentheses
-8f+9=0
We move all terms containing f to the left, all other terms to the right
-8f=-9
f=-9/-8
f=1+1/8
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