document.write( "Question 757449: What property of real number is this? 9+(-9)=0 \n" ); document.write( "
Algebra.Com's Answer #460807 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "Additive Inverse (Opposite)\r
\n" ); document.write( "\n" ); document.write( "For every real number \"a\" there exist a real number, denoted \"-a\", such that\r
\n" ); document.write( "\n" ); document.write( "\"a+%2B+%28-a%29+=+0\"
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