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H in (-oo:+oo)
5/7 = H/42 // - H/42
5/7-(H/42) = 0
5/7-1/42*H = 0 // - 5/7
-1/42*H = -5/7 // : -1/42
H = -5/7/(-1/42)
H = 30
H = 30
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