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q in (-oo:+oo)
1/5 = 9-((2/5)*q) // - 9-((2/5)*q)
(2/5)*q+1/5-9 = 0
2/5*q-44/5 = 0 // + 44/5
2/5*q = 44/5 // : 2/5
q = 44/5/2/5
q = 22
q = 22
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