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h in (-oo:+oo)
(3/8)*h = 1/4 // - 1/4
(3/8)*h-(1/4) = 0
(3/8)*h-1/4 = 0
3/8*h-1/4 = 0 // + 1/4
3/8*h = 1/4 // : 3/8
h = 1/4/3/8
h = 2/3
h = 2/3
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