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h in (-oo:+oo)
2/35 = h/80 // - h/80
2/35-(h/80) = 0
2/35-1/80*h = 0 // - 2/35
-1/80*h = -2/35 // : -1/80
h = -2/35/(-1/80)
h = 32/7
h = 32/7
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