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