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h in (-oo:+oo)
255 = 85*(1/3)*h // - 85*(1/3)*h
255-(85*(1/3)*h) = 0
(-85/3)*h+255 = 0
255-85/3*h = 0 // - 255
-85/3*h = -255 // : -85/3
h = -255/(-85/3)
h = 9
h = 9
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