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q in (-oo:+oo)
(2/3)*q-2 = (1/3)*q // - (1/3)*q
(2/3)*q-((1/3)*q)-2 = 0
(2/3)*q+(-1/3)*q-2 = 0
1/3*q-2 = 0 // + 2
1/3*q = 2 // : 1/3
q = 2/1/3
q = 6
q = 6
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