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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*b = 38/x // - 38/x
5*b-(38/x) = 0
5*b-38*x^-1 = 0
-38*x^-1 = -(5*b) // : -38
x^-1 = (-5*b)/(-38)
-1 < 0
1/(x^1) = (-5*b)/(-38) // * x^1
1 = ((-5*b)/(-38))*x^1 // : (-5*b)/(-38)
(38*b^-1)/5 = x^1
x = (38*b^-1)/5
x = (38*b^-1)/5
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