\
The expression is
\
(Replace
f
with 28)
\
(Subtract:
)
\
The value of the expression is 16.
\
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5bfd827407984181ab7d98983f6a2f04.png\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=28daad8a52e91935edc22ae20129e43f.png\")
(Replace f with 28)![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=cde633734bc714ba49725a8260950284.png\")
(Subtract: ![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f639aa54d8944a9baec75c5f32170b65.png\")
) ![\"\"](\"/userfiles/image/steps_images/solution.JPG\")