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