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q in (-oo:+oo)
11/12-(((1*q)/6)*q)-(1/3) = 0
(-1/6)*q^2+11/12-1/3 = 0
-1/6*q^2 = -7/12 // : -1/6
q^2 = 7/2
q^2 = 7/2 // ^ 1/2
abs(q) = (7/2)^(1/2)
q = (7/2)^(1/2) or q = -(7/2)^(1/2)
q in { (7/2)^(1/2), -(7/2)^(1/2) }
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