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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
2/3 = 18/s // - 18/s
2/3-(18/s) = 0
2/3-18*s^-1 = 0
-18*s^-1 = -2/3 // : -18
s^-1 = 1/27
-1 < 0
1/(s^1) = 1/27 // * s^1
1 = 1/27*s^1 // : 1/27
27 = s^1
s = 27
s = 27
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