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