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12*x-(x*((96*x^2)/12)) = 0
12*x-8*x^3 = 0
12*x-8*x^3 = 0
4*x*(3-2*x^2) = 0
-2*x^2 = -3 // : -2
x^2 = 3/2
x^2 = 3/2 // ^ 1/2
abs(x) = (3/2)^(1/2)
x = (3/2)^(1/2) or x = -(3/2)^(1/2)
4*x = 0
4*x = 0 // : 4
x = 0
x in { (3/2)^(1/2), -(3/2)^(1/2), 0 }
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