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h in (-oo:+oo)
(6/7)*h = 4/5 // - 4/5
(6/7)*h-(4/5) = 0
(6/7)*h-4/5 = 0
6/7*h-4/5 = 0 // + 4/5
6/7*h = 4/5 // : 6/7
h = 4/5/6/7
h = 14/15
h = 14/15
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