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h in (-oo:+oo)
88-38 = (47/5)*(h-7) // - (47/5)*(h-7)
88-((47/5)*(h-7))-38 = 0
(-47/5)*(h-7)-38+88 = 0
88-47/5*(h-7)-38 = 0
88-47/5*(h-7)-38 = 0
139/5-47/5*h+88 = 0
579/5-47/5*h = 0
579/5-47/5*h = 0
579/5-47/5*h = 0 // - 579/5
-47/5*h = -579/5 // : -47/5
h = -579/5/(-47/5)
h = 579/47
h = 579/47
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