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D( x )
(0.5-x)^2 = 0
(0.5-x)^2 = 0
(0.5-x)^2 = 0
0.5-x = 0 // - 0.5
-x = -0.5 // * -1
x = 0.5
x in (-oo:0.5) U (0.5:+oo)
0.75/((0.5-x)^2) = 0
x belongs to the empty set
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