document.write( "Question 381359: Could someone please explain? Thank You!\r
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Algebra.Com's Answer #270482 by richard1234(7193)\"\" \"About 
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By the difference of two squares theorem, x^2 - 81 = (x-9)(x+9) Therefore the fraction becomes (x-9)(x+9)/(x+9) = x-9. \n" ); document.write( "
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