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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
14/s = 2 // - 2
14/s-2 = 0
14*s^-1 = 2 // : 14
s^-1 = 1/7
-1 < 0
1/(s^1) = 1/7 // * s^1
1 = 1/7*s^1 // : 1/7
7 = s^1
s = 7
s = 7
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