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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
-16/s = -4 // + 4
4-16/s = 0
-16*s^-1 = -4 // : -16
s^-1 = 1/4
-1 < 0
1/(s^1) = 1/4 // * s^1
1 = 1/4*s^1 // : 1/4
4 = s^1
s = 4
s = 4
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