The expression is .
(product of two different sings is negative)
The common denominator is , So .
The simplified expression is .
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(product of two different sings is negative) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0c6ef9e17b322aaaf2c0c454bb120574.png\")
, So ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8d20f28c66ddeebcf5e2a5d2c33e8723.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=69926a007efa1c12c3249cbaea022852.png\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
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.