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