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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
65/s = 15 // - 15
65/s-15 = 0
65*s^-1 = 15 // : 65
s^-1 = 3/13
-1 < 0
1/(s^1) = 3/13 // * s^1
1 = 3/13*s^1 // : 3/13
13/3 = s^1
s = 13/3
s = 13/3
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