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q in (-oo:+oo)
q*((q^3)/3-(10*q^2)+500*q) = 0
q*((q^3)/3-10*q^2+500*q) = 0
q*(1/3*q^3-10*q^2+500*q) = 0
1/3*q^3-10*q^2+500*q = 0
q*(1/3*q^2-10*q+500) = 0
1/3*q^2-10*q+500 = 0
DELTA = (-10)^2-(1/3*4*500)
DELTA = -1700/3
DELTA < 0
q = 0
q^2 = 0
( q )
q = 0
q in { 0, 0 }
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