The expression is .
(Apply commutative property of addition)
(Add: )
= 0 (Apply additive inverse property: )
The sum is 0.
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(Apply commutative property of addition)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=eda065967c437ee30d30f392aba45486.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2253e8fe25125581248a8eb848a6582e.png\")
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)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")