The expression is .
(Apply associative property of addition: )
(Add: )
The simplified expression is z + 16.
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![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=40d96bb9e51c06604f3fd9b8a7ff005c.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6ccf14160a2c6582436edb744046b0ba.png\")
(Apply associative property of addition: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=63b30614ae855254f4086bd0186079d1.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b8104be185ae540c786b7f4df8743907.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=30aa16bfcf3740c9f3effd6b2415b29f.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")