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h in (-oo:+oo)
(2/7)*h-((1/3)*h) > -6 // + 6
(2/7)*h-((1/3)*h)+6 > 0
(2/7)*h+(-1/3)*h+6 > 0
6-1/21*h > 0 // - 6
-1/21*h > -6 // : -1/21
h < -6/(-1/21)
h < 126
h in (-oo:126)
(-oo:126)
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