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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
15/26 = 12/f // - 12/f
15/26-(12/f) = 0
15/26-12*f^-1 = 0
-12*f^-1 = -15/26 // : -12
f^-1 = 5/104
-1 < 0
1/(f^1) = 5/104 // * f^1
1 = 5/104*f^1 // : 5/104
104/5 = f^1
f = 104/5
f = 104/5
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