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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y-(1/x) = 3/5 // - 3/5
y-(1/x)-(3/5) = 0
y-x^-1-3/5 = 0
-1*x^-1 = -(y-3/5) // : -1
x^-1 = y-3/5
-1 < 0
1/(x^1) = y-3/5 // * x^1
1 = x^1*(y-3/5) // : y-3/5
1/(y-3/5) = x^1
x = 1/(y-3/5)
x = 1/(y-3/5)
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