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