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h in (-oo:+oo)
(1/3)*h-(4*((2/3)*h-3)) = (2/3)*h-6 // - (2/3)*h-6
(1/3)*h-(4*((2/3)*h-3))-((2/3)*h)+6 = 0
(1/3)*h-4*((2/3)*h-3)+(-2/3)*h+6 = 0
h/3-4*(2/3*h-3)+(-2*h)/3+6 = 0
(-4*3*(2/3*h-3))/3+h/3+(-2*h)/3+(3*6)/3 = 0
h-4*3*(2/3*h-3)-2*h+3*6 = 0
18-7*h-2*h+36 = 0
18-9*h+36 = 0
54-9*h = 0
(54-9*h)/3 = 0
(54-9*h)/3 = 0 // * 3
54-9*h = 0
54-9*h = 0 // - 54
-9*h = -54 // : -9
h = -54/(-9)
h = 6
h = 6
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