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q in (-oo:+oo)
(-1*q)/5-4 = 9 // - 9
(-1*q)/5-9-4 = 0
-q/5-9-4 = 0
-1/5*q-13 = 0 // + 13
-1/5*q = 13 // : -1/5
q = 13/(-1/5)
q = -65
q = -65
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