The expression is
(Replace c, a with 11 and 9)
(Multiply: )
(Subtract: )
The value of the expression is 19.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7621771180b3a2b8b8962c18e585cba3.png\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7bdeef0dbf925c9195f3d1f9e47e3400.png\")
(Replace c, a with 11 and 9)![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2d35c911aef86ba0c676e5bb739a7c09.png\")
(Multiply: ![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=84ccbc72a7614ff8b59644576e28a4f6.png\")
)![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=70d9e9ef0dadfcf813b598cf0f257d75.png\")
(Multiply: ![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a6b90a748a224ab7f9f6159b5d404375.png\")
)![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=015e9ee7d307d1c40728a5cbb60f04da.png\")
(Subtract: ![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9d29671d00ce8c04dd29c036a3e3bcb3.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")