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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X+5/x = 2 // - 2
X+5/x-2 = 0
5*x^-1 = -(X-2) // : 5
x^-1 = (2-X)/5
-1 < 0
1/(x^1) = (2-X)/5 // * x^1
1 = x^1*((2-X)/5) // : (2-X)/5
5*(2-X)^-1 = x^1
x = 5*(2-X)^-1
x = 5*(2-X)^-1
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