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f(-1)=16(-1)+32(-1)+4
We move all terms to the left:
f(-1)-(16(-1)+32(-1)+4)=0
We add all the numbers together, and all the variables
f(-1)+44=0
We multiply parentheses
-1f+44=0
We move all terms containing f to the left, all other terms to the right
-f=-44
f=-44/-1
f=+44
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