The expression is .
(Commutative property: )
(Associative property: )
(Substitution: )
The value of the expression is 420.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=89282293162e19eec780d1ee35065918.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0c982ef0b18c0e6dc476a740b328d2e7.png\")
(Commutative property: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=088f6b8731f42be5590e754c8fa5f6c0.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d2cfdac0b11e31ae604502ef641121e4.png\")
(Associative property: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ea13ad622d1fed1fdc541cf7efeff669.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=95f31c3b68eaf3dc553d70b593aef420.png\")
(Substitution: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a2279b4297789eb725a5e5e781a9e028.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=74f81009fc813db13a10d0ef37b83202.png\")
(Substitution: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=969d69e2d7c112978bc1016d0e57389e.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")