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q in (-oo:+oo)
15/13 = q/10 // - q/10
15/13-(q/10) = 0
15/13-1/10*q = 0 // - 15/13
-1/10*q = -15/13 // : -1/10
q = -15/13/(-1/10)
q = 150/13
q = 150/13
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