The equation is .
According to subtraction property of equality: Subtract 7 from each side.
(Subtract: )
The value of .
![\"\"](\"/userfiles/image/Library/subtraction_property_of_equality.gif\")
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ff69b91e56d27498d580cf12e05eb5ef.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c1666361037717fa1339adb577ba0691.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=51c01099bfcba3079909b329cc3237a1.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8bbe92f62ec3e308d6dca00c3ef321b1.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=51c01099bfcba3079909b329cc3237a1.png\")
.