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