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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
7/s = 4*s-((1/5)*s) // - 4*s-((1/5)*s)
(1/5)*s-(4*s)+7/s = 0
(1/5)*s-4*s+7/s = 0
7*s^-1-19/5*s^1 = 0
(7*s^0-19/5*s^2)/(s^1) = 0 // * s^2
s^1*(7*s^0-19/5*s^2) = 0
s^1
(-19/5)*s^2+7 = 0
(-19/5)*s^2+7 = 0
DELTA = 0^2-(4*7*(-19/5))
DELTA = 532/5
DELTA > 0
s = ((532/5)^(1/2)+0)/(2*(-19/5)) or s = (0-(532/5)^(1/2))/(2*(-19/5))
s = -5/38*(532/5)^(1/2) or s = 5/38*(532/5)^(1/2)
s in { -5/38*(532/5)^(1/2), 5/38*(532/5)^(1/2)}
s in { -5/38*(532/5)^(1/2), 5/38*(532/5)^(1/2) }
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