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D( x )
8*x = 0
8*x = 0
8*x = 0
8*x = 0 // : 8
x = 0
x in (-oo:0) U (0:+oo)
5*((1-x)/(8*x)) = 0
(5*(1-x))/(8*x) = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x = 1
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