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y in (-oo:+oo)
(15/20)*y < 20/20 // - 20/20
(15/20)*y-(20/20) < 0
(15/20)*y-1 < 0
3/4*y-1 < 0 // + 1
3/4*y < 1 // : 3/4
y < 1/3/4
y < 4/3
y in (-oo:4/3)
(-oo:4/3)
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