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Q in (-oo:+oo)
(Q-4)/3 = -2 // + 2
(Q-4)/3+2 = 0
(Q-4)/3+(2*3)/3 = 0
Q+2*3-4 = 0
Q+2 = 0
(Q+2)/3 = 0
(Q+2)/3 = 0 // * 3
Q+2 = 0
Q+2 = 0 // - 2
Q = -2
Q = -2
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