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Y in (-oo:+oo)
Y/2 < -3 // + 3
Y/2+3 < 0
1/2*Y+3 < 0 // - 3
1/2*Y < -3 // : 1/2
Y < -3/1/2
Y < -6
Y in (-oo:-6)
(-oo:-6)
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