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h in (-oo:+oo)
(5/6)*h = 4/9 // - 4/9
(5/6)*h-(4/9) = 0
(5/6)*h-4/9 = 0
5/6*h-4/9 = 0 // + 4/9
5/6*h = 4/9 // : 5/6
h = 4/9/5/6
h = 8/15
h = 8/15
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