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h in (-oo:+oo)
40/48 = h/42 // - h/42
40/48-(h/42) = 0
5/6-1/42*h = 0 // - 5/6
-1/42*h = -5/6 // : -1/42
h = -5/6/(-1/42)
h = 35
h = 35
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