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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
9 = 54/s // - 54/s
9-(54/s) = 0
9-54*s^-1 = 0
-54*s^-1 = -9 // : -54
s^-1 = 1/6
-1 < 0
1/(s^1) = 1/6 // * s^1
1 = 1/6*s^1 // : 1/6
6 = s^1
s = 6
s = 6
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