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h in (-oo:+oo)
4 < (2/3)*h // - (2/3)*h
4-((2/3)*h) < 0
(-2/3)*h+4 < 0
4-2/3*h < 0 // - 4
-2/3*h < -4 // : -2/3
h > -4/(-2/3)
h > 6
h in (6:+oo)
(6:+oo)
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