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Y in (-oo:+oo)
Y/4 < 1.6 // - 1.6
Y/4-1.6 < 0
1/4*Y-1.6 < 0 // + 1.6
1/4*Y < 1.6 // : 1/4
Y < 1.6/1/4
Y < 6.4
Y in (-oo:6.4)
(-oo:6.4)
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