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