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h in (-oo:+oo)
(2/3)*h-9 = 6-((2/3)*h) // - 6-((2/3)*h)
(2/3)*h+(2/3)*h-9-6 = 0
4/3*h-15 = 0 // + 15
4/3*h = 15 // : 4/3
h = 15/4/3
h = 45/4
h = 45/4
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