The sum of a number and its additive inverse is zero.
(Subtract from each side)
Apply Additive inverse proparty: .
(Apply additive identity proparty: a + 0 = a)
. \ \
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(Subtract ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=bf1818186c7563bb5296b45da4078c5d.png\")
from each side)![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=768db47418b7a22cec9ef93a284f41e8.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3454e91e4d07e080043c8a8080787e5e.png\")
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(Apply additive identity proparty: a + 0 = a)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
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