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s in (-oo:+oo)
((9*s)/18)*s^2+9*s^2+81*s = 0
1/2*s^3+9*s^2+81*s = 0
s*(1/2*s^2+9*s+81) = 0
1/2*s^2+9*s+81 = 0
DELTA = 9^2-(1/2*4*81)
DELTA = -81
DELTA < 0
s = 0
s = 0
s = 0
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