.htaccess rewriting

Would someone please be able to help me with .htaccess to change:

http://site.com/subfolder/?value=click&class=XXX

to

http://site.com/?id=XXX

Where XXX is a number?

Thank you in advance.

The user should visit /?id=XXX but should see /subfolder/?value=click&class=XXX?

Try
Options +FollowSymLinks

RewriteEngine On

RewriteCond %{QUERY_STRING} ^(.*&)?id(=.+)$ [NC]
RewriteRule ^$ /subfolder/?value=click&%1class%2 [L]