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q in (-oo:+oo)
(q^1)/2 > 1/3 // - 1/3
(q^1)/2-(1/3) > 0
q/2-1/3 > 0
1/2*q-1/3 > 0 // + 1/3
1/2*q > 1/3 // : 1/2
q > 1/3/1/2
q > 2/3
q in (2/3:+oo)
(2/3:+oo)
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