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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
36/21 = 24/s // - 24/s
36/21-(24/s) = 0
36/21-24*s^-1 = 0
-24*s^-1 = -12/7 // : -24
s^-1 = 1/14
-1 < 0
1/(s^1) = 1/14 // * s^1
1 = 1/14*s^1 // : 1/14
14 = s^1
s = 14
s = 14
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