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q in (-oo:+oo)
11/13 = q/12 // - q/12
11/13-(q/12) = 0
11/13-1/12*q = 0 // - 11/13
-1/12*q = -11/13 // : -1/12
q = -11/13/(-1/12)
q = 132/13
q = 132/13
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