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h in (-oo:+oo)
(2/3)*(h-27) = 6-((2/3)*h) // - 6-((2/3)*h)
(2/3)*(h-27)+(2/3)*h-6 = 0
2/3*(h-27)+(2*h)/3-6 = 0
(2/3*3*(h-27))/3+(2*h)/3+(-6*3)/3 = 0
2/3*3*(h-27)+2*h-6*3 = 0
4*h-54-18 = 0
4*h-72 = 0
(4*h-72)/3 = 0
(4*h-72)/3 = 0 // * 3
4*h-72 = 0
4*h-72 = 0 // + 72
4*h = 72 // : 4
h = 72/4
h = 18
h = 18
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