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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
8/s-3 = -2/5 // + -2/5
8/s-(-2/5)-3 = 0
8/s+2/5-3 = 0
8*s^-1 = 13/5 // : 8
s^-1 = 13/40
-1 < 0
1/(s^1) = 13/40 // * s^1
1 = 13/40*s^1 // : 13/40
40/13 = s^1
s = 40/13
s = 40/13
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