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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-1)*((32-(2*x))/x) = 0
(x-1)*((32-2*x)/x) = 0
((x-1)*(32-2*x))/x = 0
( 32-2*x )
32-2*x = 0 // - 32
-2*x = -32 // : -2
x = -32/(-2)
x = 16
( x-1 )
x-1 = 0 // + 1
x = 1
x in { 16, 1 }
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