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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
78 = 6/s // - 6/s
78-(6/s) = 0
78-6*s^-1 = 0
-6*s^-1 = -78 // : -6
s^-1 = 13
-1 < 0
1/(s^1) = 13 // * s^1
1 = 13*s^1 // : 13
1/13 = s^1
s = 1/13
s = 1/13
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