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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x-(9/x)-25 = 4/60 // - 4/60
9/x-(9/x)-(4/60)-25 = 0
9/x-9*x^-1-1/15-25 = 0
-376/15 = 0
x belongs to the empty set
x belongs to the empty set
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