Index: wp-content/themes/twentytwelve/rtl.css
===================================================================
--- wp-content/themes/twentytwelve/rtl.css	(revision 21426)
+++ wp-content/themes/twentytwelve/rtl.css	(working copy)
@@ -18,12 +18,6 @@
 -------------------------------------------------------------- */
 
 /* Images */
-.alignright {
-	float: right;
-}
-.alignleft {
-	float: left;
-}
 .site-content .gallery-columns-4 .gallery-item {
 	padding-left: 2%;
 	padding-right: 0;