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h in (-oo:+oo)
5/6 = h/20 // - h/20
5/6-(h/20) = 0
5/6-1/20*h = 0 // - 5/6
-1/20*h = -5/6 // : -1/20
h = -5/6/(-1/20)
h = 50/3
h = 50/3
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