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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
18/7.2 = 15/s // - 15/s
18/7.2-(15/s) = 0
18/7.2-15*s^-1 = 0
-15*s^-1 = -2.5 // : -15
s^-1 = 0.16666667
-1 < 0
1/(s^1) = 0.16666667 // * s^1
1 = 0.16666667*s^1 // : 0.16666667
5.99999988 = s^1
s = 5.99999988
s = 5.99999988
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