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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
23-60/x = 0
-60*x^-1 = -23 // : -60
x^-1 = 23/60
-1 < 0
1/(x^1) = 23/60 // * x^1
1 = 23/60*x^1 // : 23/60
60/23 = x^1
x = 60/23
x = 60/23
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