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H in (-oo:+oo)
2/15 = H/40 // - H/40
2/15-(H/40) = 0
2/15-1/40*H = 0 // - 2/15
-1/40*H = -2/15 // : -1/40
H = -2/15/(-1/40)
H = 16/3
H = 16/3
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