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q in (-oo:+oo)
16/10 = q/13 // - q/13
16/10-(q/13) = 0
8/5-1/13*q = 0 // - 8/5
-1/13*q = -8/5 // : -1/13
q = -8/5/(-1/13)
q = 104/5
q = 104/5
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