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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
-14/5*q-9 = 0 // + 9
-14/5*q = 9 // : -14/5
q = 9/(-14/5)
q = -45/14
q = -45/14
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