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h in (-oo:+oo)
(2/7)*h = 1/8 // - 1/8
(2/7)*h-(1/8) = 0
(2/7)*h-1/8 = 0
2/7*h-1/8 = 0 // + 1/8
2/7*h = 1/8 // : 2/7
h = 1/8/2/7
h = 7/16
h = 7/16
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