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D( x )
x-(1/2) = 0
x-(1/2) = 0
x-(1/2) = 0
x-1/2 = 0
x-1/2 = 0 // + 1/2
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
Y = x/(x-(1/2)) // - x/(x-(1/2))
Y-(x/(x-(1/2))) = 0
Y-(x/(x-1/2)) = 0
(-1*x)/(x-1/2)+Y = 0
(-1*x)/(x-1/2)+(Y*(x-1/2))/(x-1/2) = 0
Y*(x-1/2)-1*x = 0
Y*x-1/2*Y-x = 0
Y*x-1/2*Y-x = 0
Y*x-1/2*Y = 0 // + -1/2*Y
Y*x = -(-1/2*Y) // : Y
x = (-(-1/2*Y))/Y
x = 1/2
x-1/2 = 0
(x-1/2)/(x-1/2) = 0
(x-1/2)/(x-1/2) = 0 // * x-1/2
x-1/2 = 0
x-1/2 = 0 // + 1/2
x = 1/2
x in { 1/2}
x belongs to the empty set
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