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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
60/x = 60/x-(52/x) // - 60/x-(52/x)
60/x-(60/x)+52/x = 0
60/x-60*x^-1+52/x = 0
52*x^-1 = 0 // : 52
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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