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h in (-oo:+oo)
(5/12)*h+47 = 100 // - 100
(5/12)*h-100+47 = 0
5/12*h-53 = 0 // + 53
5/12*h = 53 // : 5/12
h = 53/5/12
h = 636/5
h = 636/5
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