document.write( "Question 1147282: Twice a certain number is subtracted from 9 times the number the result is 21 find the number. \n" ); document.write( "
Algebra.Com's Answer #768601 by Alan3354(69443)\"\" \"About 
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Twice a certain number is subtracted from 9 times the number the result is 21 find the number.
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\n" ); document.write( "Use n for the \"certain number.\"
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\n" ); document.write( "then, Twice a certain number = 2n
\n" ); document.write( "9 times the number = 9n
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