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q in (-oo:+oo)
(1/5)*q = 8-((2/5)*q) // - 8-((2/5)*q)
(1/5)*q+(2/5)*q-8 = 0
3/5*q-8 = 0 // + 8
3/5*q = 8 // : 3/5
q = 8/3/5
q = 40/3
q = 40/3
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