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f(-1)=8(3-1)
We move all terms to the left:
f(-1)-(8(3-1))=0
We add all the numbers together, and all the variables
f(-1)-(82)=0
We add all the numbers together, and all the variables
f(-1)-82=0
We multiply parentheses
-1f-82=0
We move all terms containing f to the left, all other terms to the right
-f=82
f=82/-1
f=-82
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