The expression is
. (Absolute value of -21 is 21)
Rewrite the expression
Value of the expression is 21.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1799f44799efccdf1b5b12717a68ea4f.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f56833abdcb324673dc919ea5bd48b49.png\")
. (Absolute value of -21 is 21)![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f56833abdcb324673dc919ea5bd48b49.png\")
![\"\"](\"/userfiles/image/steps_images/solution.JPG\")