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