The expression is .
(Apply commutative property of addition: )
(Subtract: )
The standard form of the expression is .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
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.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1f00b29435d9dc575ef48c075ab39793.png\")
(Apply commutative property of addition: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=04ab48db2a6385513b3391bf07d33cff.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=abff0fff732841eda1df6d0efe97c706.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b22c61a74f4a48158b3fae468998ed02.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=472a5f6a244dc3791184a16ec6c2dbea.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6e9c90ef79ceb24ec763f7a8ceba42bc.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
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.