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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
35/f = 2 // - 2
35/f-2 = 0
35*f^-1 = 2 // : 35
f^-1 = 2/35
-1 < 0
1/(f^1) = 2/35 // * f^1
1 = 2/35*f^1 // : 2/35
35/2 = f^1
f = 35/2
f = 35/2
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