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h in (-oo:+oo)
(2/5)*h = 5/11 // - 5/11
(2/5)*h-(5/11) = 0
(2/5)*h-5/11 = 0
2/5*h-5/11 = 0 // + 5/11
2/5*h = 5/11 // : 2/5
h = 5/11/2/5
h = 25/22
h = 25/22
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