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h in (-oo:+oo)
(4/7)*h = 1/5 // - 1/5
(4/7)*h-(1/5) = 0
(4/7)*h-1/5 = 0
4/7*h-1/5 = 0 // + 1/5
4/7*h = 1/5 // : 4/7
h = 1/5/4/7
h = 7/20
h = 7/20
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