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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
5/f = 4/6.8 // - 4/6.8
5/f-(4/6.8) = 0
5/f-0.58823529 = 0
5*f^-1 = 0.58823529 // : 5
f^-1 = 0.11764706
-1 < 0
1/(f^1) = 0.11764706 // * f^1
1 = 0.11764706*f^1 // : 0.11764706
8.49999992 = f^1
f = 8.49999992
f = 8.49999992
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