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q in (-oo:+oo)
-9/13 = (15/52)*q // - (15/52)*q
-((15/52)*q)-9/13 = 0
(-15/52)*q-9/13 = 0
-15/52*q-9/13 = 0 // + 9/13
-15/52*q = 9/13 // : -15/52
q = 9/13/(-15/52)
q = -12/5
q = -12/5
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