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