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q in (-oo:+oo)
(7/8)*q = 1/6 // - 1/6
(7/8)*q-(1/6) = 0
(7/8)*q-1/6 = 0
7/8*q-1/6 = 0 // + 1/6
7/8*q = 1/6 // : 7/8
q = 1/6/7/8
q = 4/21
q = 4/21
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