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((4*x^2)/20)*x^3-(12*x^2) = 0
((4*x^2)/20)*x^3-12*x^2 = 0
1/5*x^5-12*x^2 = 0
x^2*(1/5*x^3-12) = 0
1/5*x^3 = 12 // : 1/5
x^3 = 60
x^3 = 60 // ^ 1/3
x = 60^(1/3)
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 60^(1/3), 0 }
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