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y in (-oo:+oo)
(5/4)*y = 15/4 // - 15/4
(5/4)*y-(15/4) = 0
(5/4)*y-15/4 = 0
5/4*y-15/4 = 0 // + 15/4
5/4*y = 15/4 // : 5/4
y = 15/4/5/4
y = 3
y = 3
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