We shall get 0 by adding with

Let x be the number to which when is added, we shall get 0.

We need to find x.

So, formulate it into a mathematical equation using operators and numbers.

x is added to can be written as,

Or,

Or,

Now, when x is added to , we get 0. That is,

To solve for x, we need to shift 5/2 to R.H.S. Positive sign of 9/8 will become negative.

Thus, we shall get 0 by adding with .