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h in (-oo:+oo)
h/(-8) = 19/(-2) // - 19/(-2)
h/(-8)-(19/(-2)) = 0
h/(-8)+19/2 = 0
19/2-1/8*h = 0 // - 19/2
-1/8*h = -19/2 // : -1/8
h = -19/2/(-1/8)
h = 76
h = 76
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