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((3*x)/9)*x^2-(6*x) = 0
((3*x)/9)*x^2-6*x = 0
1/3*x^3-6*x = 0
x*(1/3*x^2-6) = 0
1/3*x^2 = 6 // : 1/3
x^2 = 18
x^2 = 18 // ^ 1/2
abs(x) = 3*2^(1/2)
x = 3*2^(1/2) or x = -(3*2^(1/2))
x = 0
x = 0
x in { 3*2^(1/2), -(3*2^(1/2)), 0 }
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