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