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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
-15/f = 3 // - 3
-15/f-3 = 0
-15*f^-1 = 3 // : -15
f^-1 = -1/5
-1 < 0
1/(f^1) = -1/5 // * f^1
1 = -1/5*f^1 // : -1/5
-5 = f^1
f = -5
f = -5
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