The expression is .
(Replace x = 2, y = 11, and z = 5)
(Add: )
(Add:)
The value of the expression is 18.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8659d4b7be3a576409255e17eba1ba34.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9c66c3aca371951bc8e306437f7a2616.png\")
(Replace x = 2, y = 11, and z = 5)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=dc121810276024a4c9aa342018785bdb.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=eec8d841ffc08a9341e70f007ebade93.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=003dab09b5097bb7842fc626fe64146a.png\")
(Add:![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7c52b6005ae9d6939a2c9519bad466ed.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")