\
\
The expression is,
\
(Commutative property of addition:
)
\
\
\
(Add:
)
\
(Add:
)
\
The sum is -2
.
![\"\"](\"/userfiles/image/Library/Commutative_Property_of_addition.gif\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=12dff126f3e7ff4c840c416e812f9add.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=881957ec4c3fa8d09c5380dc16930a63.png\")
(Commutative property of addition:![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=04ab48db2a6385513b3391bf07d33cff.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8921739d6fdc752cce07e5f6bc0650ef.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=efb8e6b296a7e19cc960a1b378ce1676.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9ef77688166cacc775544fd082a62ae2.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=68f51cb10f49187cb472839deed66f76.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")