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((6*x^2)/15)*x^2-(6*x) = 0
((6*x^2)/15)*x^2-6*x = 0
2/5*x^4-6*x = 0
2*x*(1/5*x^3-3) = 0
1/5*x^3 = 3 // : 1/5
x^3 = 15
x^3 = 15 // ^ 1/3
x = 15^(1/3)
2*x = 0
2*x = 0 // : 2
x = 0
x in { 15^(1/3), 0 }
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