document.write( "Question 639197: blank + blank + blank = 21 lb.\r
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Algebra.Com's Answer #402627 by jim_thompson5910(35256)\"\" \"About 
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x+x+x = 21\r
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\n" ); document.write( "\n" ); document.write( "3x = 21\r
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\n" ); document.write( "\n" ); document.write( "x = 21/3\r
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\n" ); document.write( "\n" ); document.write( "x = 7\r
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\n" ); document.write( "\n" ); document.write( "So \r
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\n" ); document.write( "\n" ); document.write( "7+7+7 = 21
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