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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25-((4*x)/x) = 4 // - 4
25-((4*x)/x)-4 = 0
25-4-4 = 0
17 = 0
x belongs to the empty set
x belongs to the empty set
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