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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
24/f = 8 // - 8
24/f-8 = 0
24*f^-1 = 8 // : 24
f^-1 = 1/3
-1 < 0
1/(f^1) = 1/3 // * f^1
1 = 1/3*f^1 // : 1/3
3 = f^1
f = 3
f = 3
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