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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
167/x = y/130 // - y/130
167/x-(y/130) = 0
167*x^-1 = -(-1/130*y) // : 167
x^-1 = 1/21710*y
-1 < 0
1/(x^1) = 1/21710*y // * x^1
1 = 1/21710*x^1*y // : 1/21710*y
21710*y^-1 = x^1
x = 21710*y^-1
x = 21710*y^-1
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