The expression is
Line up the decimal points and subtract the corresponding columns.
(Subtract: )
The difference is .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=576744b2d2373f3450b3ee5ae07afa9f.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ff8fb7c29c0c9dd0fc7c92aa57f3da2e.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=18da29ab58debb2533bf78cfb6bc358d.png\")
) ![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1002ac529426e5e26612f87157ab9c3c.png\")
.