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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
175/x = y // - y
175/x-y = 0
175*x^-1 = y // : 175
x^-1 = y/175
-1 < 0
1/(x^1) = y/175 // * x^1
1 = x^1*(y/175) // : y/175
175*y^-1 = x^1
x = 175*y^-1
x = 175*y^-1
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