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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
18 = 360/s // - 360/s
18-(360/s) = 0
18-360*s^-1 = 0
-360*s^-1 = -18 // : -360
s^-1 = 1/20
-1 < 0
1/(s^1) = 1/20 // * s^1
1 = 1/20*s^1 // : 1/20
20 = s^1
s = 20
s = 20
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