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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
77/s = 132/48 // - 132/48
77/s-(132/48) = 0
77/s-11/4 = 0
77*s^-1 = 11/4 // : 77
s^-1 = 1/28
-1 < 0
1/(s^1) = 1/28 // * s^1
1 = 1/28*s^1 // : 1/28
28 = s^1
s = 28
s = 28
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