The operator \(@\) is defined by the following expression: \(a@b=\left|\dfrac{a+1}{a}\right|-\dfrac{b+1}{b}\) where \(ab\ne 0.\) What is the sum of the solutions to the equation \(x@2=\dfrac{x@(-1)}2?\)

A. -1

B. -0.75

C. -0.25

D. 0.25

E. 0.75

Answer: D

Source: Manhattan GMAT