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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
13/s = 2 // - 2
13/s-2 = 0
13*s^-1 = 2 // : 13
s^-1 = 2/13
-1 < 0
1/(s^1) = 2/13 // * s^1
1 = 2/13*s^1 // : 2/13
13/2 = s^1
s = 13/2
s = 13/2
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