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q in (-oo:+oo)
(1/5)*q = 9-((2/3)*q) // - 9-((2/3)*q)
(1/5)*q+(2/3)*q-9 = 0
13/15*q-9 = 0 // + 9
13/15*q = 9 // : 13/15
q = 9/13/15
q = 135/13
q = 135/13
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