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y in (-oo:+oo)
(5/4)*y-(5*y) = 9 // - 9
(5/4)*y-(5*y)-9 = 0
(5/4)*y-5*y-9 = 0
-15/4*y-9 = 0 // + 9
-15/4*y = 9 // : -15/4
y = 9/(-15/4)
y = -12/5
y = -12/5
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