I am writing this code in page.php for removing the sidebar in one page

```
<?php if (is_page('x')) : ?>
<?php else : ?>
<?php get_sidebar(); ?>
<?php endif; ?>

```

... where `"x"` is the ID of that page.

but I am having a bit of trouble though the forum which is the page in question does not stretch across the whole page. how can I solve this problem?