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