The equation is .
Apply subtraction property of equality: Subtract 4 from each side.
(Subtract: )
The value is .
![\"\"](\"/userfiles/image/Library/subtraction_property_of_equality.gif\")
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2277c02bd15b83aa42d208ba93418bb2.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=628e3b19b178affc3d62f0cfb76d6793.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f1860ffe4a0e3fb92e8eb6ad8a2c32e8.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=de729806aa0d6a87fce69f8e0dfb36f7.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=71ec2f9fe2d6de30879187d36379bb56.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5aef5f9e5f07077bbb1a22802d563174.png\")
)![\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=71ec2f9fe2d6de30879187d36379bb56.png\")
.