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h in (-oo:+oo)
5/8 = h/40 // - h/40
5/8-(h/40) = 0
5/8-1/40*h = 0 // - 5/8
-1/40*h = -5/8 // : -1/40
h = -5/8/(-1/40)
h = 25
h = 25
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