The expression is
(Substitute in original expression)
(Subtract: )
The value of the expression is 12.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0e274ed181805e5fa2fead5bba4a947c.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9a370c6fb89292dc1d75bef14b67e540.png\")
(Substitute ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9ff18fcebb42f9dc9a3d54741123652a.png\")
in original expression)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=497e3ca02116d7188ea6669c409c5a4b.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5a38f27a4d17df0809a10432e5d2f64b.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")