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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
167/x = 130 // - 130
167/x-130 = 0
167*x^-1 = 130 // : 167
x^-1 = 130/167
-1 < 0
1/(x^1) = 130/167 // * x^1
1 = 130/167*x^1 // : 130/167
167/130 = x^1
x = 167/130
x = 167/130
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