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h in (-oo:+oo)
h/25 = 3.8 // - 3.8
h/25-3.8 = 0
1/25*h-3.8 = 0 // + 3.8
1/25*h = 3.8 // : 1/25
h = 3.8/1/25
h = 95
h = 95
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