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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
560/770 = 512/s // - 512/s
560/770-(512/s) = 0
560/770-512*s^-1 = 0
-512*s^-1 = -8/11 // : -512
s^-1 = 1/704
-1 < 0
1/(s^1) = 1/704 // * s^1
1 = 1/704*s^1 // : 1/704
704 = s^1
s = 704
s = 704
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