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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
60/x-38 = 48 // - 48
60/x-48-38 = 0
60*x^-1 = 86 // : 60
x^-1 = 43/30
-1 < 0
1/(x^1) = 43/30 // * x^1
1 = 43/30*x^1 // : 43/30
30/43 = x^1
x = 30/43
x = 30/43
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