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h in (-oo:+oo)
1/3-(4*((2/3)*h-3)) = (2/3)*h-6 // - (2/3)*h-6
1/3-(4*((2/3)*h-3))-((2/3)*h)+6 = 0
(-2/3)*h-4*((2/3)*h-3)+1/3+6 = 0
(-2*h)/3-4*(2/3*h-3)+1/3+6 = 0
(-4*3*(2/3*h-3))/3+(-2*h)/3+1/3+(3*6)/3 = 0
3*6-4*3*(2/3*h-3)-2*h+1 = 0
1-10*h+18+36 = 0
18-10*h+37 = 0
55-10*h = 0
(55-10*h)/3 = 0
(55-10*h)/3 = 0 // * 3
55-10*h = 0
55-10*h = 0 // - 55
-10*h = -55 // : -10
h = -55/(-10)
h = 11/2
h = 11/2
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