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h in (-oo:+oo)
12*h^3-(4*h^2)+(h/2)*h = 0
12*h^3-4*h^2+(h/2)*h = 0
12*h^3-7/2*h^2 = 0
h^2*(12*h-7/2) = 0
12*h-7/2 = 0 // + 7/2
12*h = 7/2 // : 12
h = 7/2/12
h = 7/24
h^2 = 0
1*h^2 = 0 // : 1
h^2 = 0
h = 0
h in { 7/24, 0 }
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