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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4-((2*x)/x) = -3/2 // + -3/2
4-((2*x)/x)-(-3/2) = 0
3/2-2+4 = 0
7/2 = 0
x belongs to the empty set
x belongs to the empty set
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