\
The sentence is, “The sum of a number k and 7”
The word “sum” indicates the symbol “”
Rewrite the sentence into expression as,
\ \
The expression is
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6970a2e8d126b43aace4050761d91989.png\")
”![\"\"](\"/userfiles/image/steps_images/step2.JPG\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=496bac346715694cd0194bcc1f53fed4.png\")
\ \
![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=67daae485ee363da11aa1d6d88d7482e.png\")