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q in (-oo:+oo)
(5/6)*q = -11/13 // + -11/13
(5/6)*q-(-11/13) = 0
(5/6)*q+11/13 = 0
5/6*q+11/13 = 0 // - 11/13
5/6*q = -11/13 // : 5/6
q = -11/13/5/6
q = -66/65
q = -66/65
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