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y in (-oo:+oo)
(2/5)*y-8 = 9-((3/8)*y) // - 9-((3/8)*y)
(2/5)*y+(3/8)*y-9-8 = 0
31/40*y-17 = 0 // + 17
31/40*y = 17 // : 31/40
y = 17/31/40
y = 680/31
y = 680/31
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