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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y/x = 2/3 // - 2/3
y/x-(2/3) = 0
y/x-2/3 = 0
x^-1*y = 2/3 // : y
x^-1 = 2/3/y
-1 < 0
1/(x^1) = 2/3/y // * x^1
1 = x^1*(2/3/y) // : 2/3/y
3/2*y = x^1
x = 3/2*y
x = 3/2*y
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