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(1/2)*x^3-8*x = 0
1/2*x^3-8*x = 0
x*(1/2*x^2-8) = 0
1/2*x^2 = 8 // : 1/2
x^2 = 16
x^2 = 16 // ^ 1/2
abs(x) = 4
x = 4 or x = -4
x = 0
x = 0
x in { 4, -4, 0 }
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