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x^2*((40*x^3)/9)-(144*x^2*x^3)+((12*x)/48)*x^2 = 0
x^2*((40*x^3)/9)-144*x^5+((12*x)/48)*x^2 = 0
1/4*x^3-1256/9*x^5 = 0
x^3*(1/4-1256/9*x^2) = 0
-1256/9*x^2 = -1/4 // : -1256/9
x^2 = 9/5024
x^2 = 9/5024 // ^ 1/2
abs(x) = (9/5024)^(1/2)
x = (9/5024)^(1/2) or x = -(9/5024)^(1/2)
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { (9/5024)^(1/2), -(9/5024)^(1/2), 0 }
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