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h in (-oo:+oo)
7-((3/8)*h) = -8 // + 8
7-((3/8)*h)+8 = 0
(-3/8)*h+7+8 = 0
15-3/8*h = 0 // - 15
-3/8*h = -15 // : -3/8
h = -15/(-3/8)
h = 40
h = 40
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