document.write( "Question 1115549: A man is 4 times as old as his son,if the difference between their aga is 21,what is the son's age?\r
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Algebra.Com's Answer #730397 by josgarithmetic(39618)\"\" \"About 
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Man, 4x
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\n" ); document.write( "\n" ); document.write( "\"4x-x=21\"
\n" ); document.write( "\"3x=21\"
\n" ); document.write( "\"x=7\"
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