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f(-8)=3+8
We move all terms to the left:
f(-8)-(3+8)=0
We add all the numbers together, and all the variables
f(-8)-11=0
We multiply parentheses
-8f-11=0
We move all terms containing f to the left, all other terms to the right
-8f=11
f=11/-8
f=-1+3/8
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