The expression is
(Replace b with 12 in original expression)
(Add: )
The value of the expression is 18.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=171dfd83679b7f444e91e44d8a986def.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=91676d236515f3af05c96b0d9dfc50ab.png\")
(Replace b with 12 in original expression)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=003dab09b5097bb7842fc626fe64146a.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4fe4c1a2902ff84787f46d7b9e9b9904.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")