\
The expression is
\
(Replace
d
with 12)
\
(Subtract:
)
\
The value of the expression is 7.
\
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=375a25c081ed276d03b984ad55eaa48b.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=939f5679962bef8d4e52ee7f9b00d41a.png\")
(Replace d with 12) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1be21a39155d72c2dee72bc92070b55d.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3957afb43f6f2447e43491f49bca667c.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")