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((6*x^2)/6)*x^2-(30*x) = 0
((6*x^2)/6)*x^2-30*x = 0
x^4-30*x = 0
x*(x^3-30) = 0
1*x^3 = 30 // : 1
x^3 = 30
x^3 = 30 // ^ 1/3
x = 30^(1/3)
x = 0
x = 0
x in { 30^(1/3), 0 }
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