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Y in (-oo:+oo)
Y/2 < 15 // - 15
Y/2-15 < 0
1/2*Y-15 < 0 // + 15
1/2*Y < 15 // : 1/2
Y < 15/1/2
Y < 30
Y in (-oo:30)
(-oo:30)
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