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h in (-oo:+oo)
(4/7)*h+(1/2)*h = 1 // - 1
(4/7)*h+(1/2)*h-1 = 0
15/14*h-1 = 0 // + 1
15/14*h = 1 // : 15/14
h = 1/15/14
h = 14/15
h = 14/15
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