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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
16/5 = 36/s // - 36/s
16/5-(36/s) = 0
16/5-36*s^-1 = 0
-36*s^-1 = -16/5 // : -36
s^-1 = 4/45
-1 < 0
1/(s^1) = 4/45 // * s^1
1 = 4/45*s^1 // : 4/45
45/4 = s^1
s = 45/4
s = 45/4
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