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H in (-oo:+oo)
H/5-2 < 13 // - 13
H/5-13-2 < 0
1/5*H-15 < 0 // + 15
1/5*H < 15 // : 1/5
H < 15/1/5
H < 75
H in (-oo:75)
(-oo:75)
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