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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
s+8/s = -9 // + 9
s+8/s+9 = 0
1*s^1+8*s^-1+9*s^0 = 0
(1*s^2+9*s^1+8*s^0)/(s^1) = 0 // * s^2
s^1*(1*s^2+9*s^1+8*s^0) = 0
s^1
s^2+9*s+8 = 0
s^2+9*s+8 = 0
DELTA = 9^2-(1*4*8)
DELTA = 49
DELTA > 0
s = (49^(1/2)-9)/(1*2) or s = (-49^(1/2)-9)/(1*2)
s = -1 or s = -8
s in { -8, -1}
s in { -8, -1 }
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