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y in (-oo:+oo)
(3/8)*y-5 = 5/8-3 // - 5/8-3
(3/8)*y-(5/8)-5+3 = 0
(3/8)*y-5/8-5+3 = 0
3/8*y-21/8 = 0 // + 21/8
3/8*y = 21/8 // : 3/8
y = 21/8/3/8
y = 7
y = 7
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