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x in (-oo:+oo)
(x^4-x^2)/100 = 0
x^4-x^2 = 0
x^2*(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*(x-1)*(x+1) = 0
(x^2*(x-1)*(x+1))/100 = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-1 )
x-1 = 0 // + 1
x = 1
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { -1, 1, 0 }
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