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x in (-oo:+oo)
(x^3)/2-((65*x^1)/2) = 0
(x^3)/2+(-65/2)*x = 0
1/2*x^3-65/2*x = 0
1/2*x*(x^2-65) = 0
1*x^2 = 65 // : 1
x^2 = 65
x^2 = 65 // ^ 1/2
abs(x) = 65^(1/2)
x = 65^(1/2) or x = -65^(1/2)
x/2 = 0
1/2*x = 0 // : 1/2
x = 0
x in { 65^(1/2), -65^(1/2), 0 }
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