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h in (-oo:+oo)
(1/3)*h-(4*((2/3)*h-3)) = 2/3-3 // - 2/3-3
(1/3)*h-(4*((2/3)*h-3))-(2/3)+3 = 0
(1/3)*h-4*((2/3)*h-3)-2/3+3 = 0
h/3-4*(2/3*h-3)-2/3+3 = 0
(-4*3*(2/3*h-3))/3+h/3-2/3+(3^2)/3 = 0
h-4*3*(2/3*h-3)-2+9 = 0
9-7*h-2+36 = 0
9-7*h+34 = 0
43-7*h = 0
(43-7*h)/3 = 0
(43-7*h)/3 = 0 // * 3
43-7*h = 0
43-7*h = 0 // - 43
-7*h = -43 // : -7
h = -43/(-7)
h = 43/7
h = 43/7
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