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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50-((2*x)/x) = 3 // - 3
50-((2*x)/x)-3 = 0
50-3-2 = 0
45 = 0
x belongs to the empty set
x belongs to the empty set
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