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q in (-oo:+oo)
(5*q^2)/6-((q^2)/3) = 72 // - 72
(5*q^2)/6-((q^2)/3)-72 = 0
1/2*q^2 = 72 // : 1/2
q^2 = 144
q^2 = 144 // ^ 1/2
abs(q) = 12
q = 12 or q = -12
q in { 12, -12 }
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