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h in (-oo:+oo)
h/8 = 0.5 // - 0.5
h/8-0.5 = 0
1/8*h-0.5 = 0 // + 0.5
1/8*h = 0.5 // : 1/8
h = 0.5/1/8
h = 4
h = 4
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