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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
5/s-(2*s)-(3*s)-6 = 0
5/s-2*s-3*s-6 = 0
5*s^-1-5*s^1-6*s^0 = 0
(5*s^0-5*s^2-6*s^1)/(s^1) = 0 // * s^2
s^1*(5*s^0-5*s^2-6*s^1) = 0
s^1
5-5*s^2-6*s = 0
5-5*s^2-6*s = 0
DELTA = (-6)^2-(-5*4*5)
DELTA = 136
DELTA > 0
s = (136^(1/2)+6)/(-5*2) or s = (6-136^(1/2))/(-5*2)
s = (2*34^(1/2)+6)/(-10) or s = (6-2*34^(1/2))/(-10)
s in { (2*34^(1/2)+6)/(-10), (6-2*34^(1/2))/(-10)}
s in { (2*34^(1/2)+6)/(-10), (6-2*34^(1/2))/(-10) }
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