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y in (-oo:+oo)
(5*y)/8+3 = 9 // - 9
(5*y)/8-9+3 = 0
5/8*y-6 = 0 // + 6
5/8*y = 6 // : 5/8
y = 6/5/8
y = 48/5
y = 48/5
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