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f(-1)=2-1+9
We move all terms to the left:
f(-1)-(2-1+9)=0
We add all the numbers together, and all the variables
f(-1)-10=0
We multiply parentheses
-1f-10=0
We move all terms containing f to the left, all other terms to the right
-f=10
f=10/-1
f=-10
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