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q in (-oo:+oo)
(3/5)*q^2-(4*q)+160 = 0
(3/5)*q^2-4*q+160 = 0
3/5*q^2-4*q+160 = 0
DELTA = (-4)^2-(3/5*4*160)
DELTA = -368
DELTA < 0
q belongs to the empty set
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