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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-(1/x_3)+5 = 0
2/x-x_3^-1+5 = 0
2*x^-1 = -(5-x_3^-1) // : 2
x^-1 = (x_3^-1-5)/2
-1 < 0
1/(x^1) = (x_3^-1-5)/2 // * x^1
1 = x^1*((x_3^-1-5)/2) // : (x_3^-1-5)/2
2*(x_3^-1-5)^-1 = x^1
x = 2*(x_3^-1-5)^-1
x = 2*(x_3^-1-5)^-1
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