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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
12/s = 4/3 // - 4/3
12/s-(4/3) = 0
12/s-4/3 = 0
12*s^-1 = 4/3 // : 12
s^-1 = 1/9
-1 < 0
1/(s^1) = 1/9 // * s^1
1 = 1/9*s^1 // : 1/9
9 = s^1
s = 9
s = 9
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