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q in (-oo:+oo)
(5*q^2)/6-((q^2)/3) = 73 // - 73
(5*q^2)/6-((q^2)/3)-73 = 0
1/2*q^2 = 73 // : 1/2
q^2 = 146
q^2 = 146 // ^ 1/2
abs(q) = 146^(1/2)
q = 146^(1/2) or q = -146^(1/2)
q in { 146^(1/2), -146^(1/2) }
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