The sum of a number and its additive inverse is zero.
(Subtract 2.5 from each side)
Apply Additive inverse proparty: .
(Apply Additive identity proparty: a + 0 = a)
.
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(Subtract 2.5 from each side)![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=768db47418b7a22cec9ef93a284f41e8.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4381b9f04f83c13cf3a3471021c6a420.png\")
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(Apply Additive identity proparty: a + 0 = a)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
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.