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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
3/s-2 = 1/7 // - 1/7
3/s-(1/7)-2 = 0
3/s-1/7-2 = 0
3*s^-1 = 15/7 // : 3
s^-1 = 5/7
-1 < 0
1/(s^1) = 5/7 // * s^1
1 = 5/7*s^1 // : 5/7
7/5 = s^1
s = 7/5
s = 7/5
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