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H in (-oo:+oo)
H/4 > -6 // + 6
H/4+6 > 0
1/4*H+6 > 0 // - 6
1/4*H > -6 // : 1/4
H > -6/1/4
H > -24
H in (-24:+oo)
(-24:+oo)
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