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q in (-oo:+oo)
(3*q^2-360-15)/(-3) = 0
(3*q^2-375)/(-3) = 0
3*q^2 = 375 // : 3
q^2 = 125
q^2 = 125 // ^ 1/2
abs(q) = 5*5^(1/2)
q = 5*5^(1/2) or q = -(5*5^(1/2))
q in { 5*5^(1/2), -(5*5^(1/2)) }
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