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h in (-oo:+oo)
(1/3)*h-(4*(2/3)) = (2/3)*h-6 // - (2/3)*h-6
(1/3)*h-((2/3)*h)-(4*(2/3))+6 = 0
(1/3)*h+(-2/3)*h-8/3+6 = 0
10/3-1/3*h = 0 // - 10/3
-1/3*h = -10/3 // : -1/3
h = -10/3/(-1/3)
h = 10
h = 10
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