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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(1/x)-4+3 = 1/2 // - 1/2
1/x-(1/x)-(1/2)-4+3 = 0
1/x-x^-1-1/2-4+3 = 0
-3/2 = 0
x belongs to the empty set
x belongs to the empty set
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