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