The expression is
(Replace a with 5 in original expression)
(Subtract: )
The value of the expression is 2.
![\"\"](\"http://c4anything.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=101e31f7fd2688c18e464b2687c9ecdc.png\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=89e9d837a286a452fffd160fcf23f4b8.png\")
(Replace a with 5 in original expression)![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5e095665a965a1a4779477fcd271e7c1.png\")
(Subtract: ![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4f3c62529d162c694934db6a7007f9cb.png\")
)![\"\"](\"http://c4anything.com/userfiles/image/steps_images/solution.JPG\")