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