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x in (-oo:+oo)
(1/2)*x^20*(x+2) = 0
1/2*x^20*(x+2) = 0
( 1/2*x^20 )
1/2*x^20 = 0 // : 1/2
x^20 = 0
x = 0
( x+2 )
x+2 = 0 // - 2
x = -2
x in { 0, -2 }
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