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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
60/x-(60/x)+3 = 1 // - 1
60/x-(60/x)-1+3 = 0
60/x-60*x^-1-1+3 = 0
2 = 0
x belongs to the empty set
x belongs to the empty set
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