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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
152/57 = 95/x // - 95/x
152/57-(95/x) = 0
152/57-95*x^-1 = 0
-95*x^-1 = -8/3 // : -95
x^-1 = 8/285
-1 < 0
1/(x^1) = 8/285 // * x^1
1 = 8/285*x^1 // : 8/285
285/8 = x^1
x = 285/8
x = 285/8
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