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y in (-oo:+oo)
(9/8)*y = 5/2 // - 5/2
(9/8)*y-(5/2) = 0
(9/8)*y-5/2 = 0
9/8*y-5/2 = 0 // + 5/2
9/8*y = 5/2 // : 9/8
y = 5/2/9/8
y = 20/9
y = 20/9
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