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h in (-oo:+oo)
(4/9)*h = 2/3 // - 2/3
(4/9)*h-(2/3) = 0
(4/9)*h-2/3 = 0
4/9*h-2/3 = 0 // + 2/3
4/9*h = 2/3 // : 4/9
h = 2/3/4/9
h = 3/2
h = 3/2
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