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