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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
80/f = 10 // - 10
80/f-10 = 0
80*f^-1 = 10 // : 80
f^-1 = 1/8
-1 < 0
1/(f^1) = 1/8 // * f^1
1 = 1/8*f^1 // : 1/8
8 = f^1
f = 8
f = 8
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