document.write( "Question 553783: solve using the addition principle\r
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Algebra.Com's Answer #361054 by Alan3354(69443)\"\" \"About 
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solve using the addition principle\r
\n" ); document.write( "\n" ); document.write( " -9+y=27
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\n" ); document.write( "Good idea.
\n" ); document.write( "Add 9 to both sides.
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