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x in (-oo:+oo)
(x^5*(8-(2*x))^1)/2 = 0
(x^5*(8-2*x))/2 = 0
( 8-2*x )
8-2*x = 0 // - 8
-2*x = -8 // : -2
x = -8/(-2)
x = 4
( x^5 )
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in { 4, 0 }
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