Remove old price from checkout page

In the checkout page of payment and delivery information i have the old (before discounts) price and the new. How do I remove/hide the old price from the page?

Hi,

I think that you'll have to edit the "cart" file of the "checkout" view of your front-end template, and customize the code to do what you want.

I think it will be difficult for me to find the place to change.