document.write( "Question 40004: The square of 9 more than a number is equal to 9 more than the square of the number. What is the number?
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Algebra.Com's Answer #25387 by fractalier(6550)\"\" \"About 
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Let the number be x. Then we have
\n" ); document.write( "(x + 9)^2 = x^2 + 9
\n" ); document.write( "x^2 + 18x + 81 = x^2 + 9
\n" ); document.write( "18x + 81 = 9
\n" ); document.write( "18x = -72
\n" ); document.write( "x = -4
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