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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y-(1/x)+3 = -1/3 // + -1/3
y-(1/x)-(-1/3)+3 = 0
y-x^-1+1/3+3 = 0
-1*x^-1 = -(y+10/3) // : -1
x^-1 = y+10/3
-1 < 0
1/(x^1) = y+10/3 // * x^1
1 = x^1*(y+10/3) // : y+10/3
1/(y+10/3) = x^1
x = 1/(y+10/3)
x = 1/(y+10/3)
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