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60*x-(x*((3*x^2)/3)) = 0
60*x-x^3 = 0
60*x-x^3 = 0
x*(60-x^2) = 0
-1*x^2 = -60 // : -1
x^2 = 60
x^2 = 60 // ^ 1/2
abs(x) = 2*15^(1/2)
x = 2*15^(1/2) or x = -(2*15^(1/2))
x = 0
x = 0
x in { 2*15^(1/2), -(2*15^(1/2)), 0 }
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