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y in (-oo:+oo)
(5/4)*y-1 = 12 // - 12
(5/4)*y-12-1 = 0
5/4*y-13 = 0 // + 13
5/4*y = 13 // : 5/4
y = 13/5/4
y = 52/5
y = 52/5
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