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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 3/185 // - 3/185
1/x-(3/185) = 0
1/x-3/185 = 0
1*x^-1 = 3/185 // : 1
x^-1 = 3/185
-1 < 0
1/(x^1) = 3/185 // * x^1
1 = 3/185*x^1 // : 3/185
185/3 = x^1
x = 185/3
x = 185/3
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