The expression is
Additive inverse of 9 is – 9. To subtract 9, add the additive inverse of 9.
(Simplify: )
The difference is -7.
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(Simplify: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=41b27c662db1d68d59abb3ae41bf0508.png\")
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