Which of the following is equivalent to this expression?

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Which of the following is equivalent to this expression?<br><img alt='images' src='https://www.fatskills.com/images2/SAT/eq03181.png'/><!--<m:math display='block' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:msup><m:mrow><m:mi>x</m:mi></m:mrow><m:mrow><m:mn>3</m:mn></m:mrow></m:msup><m:mfenced open='(' close=')'><m:mrow><m:mrow><m:msup><m:mrow><m:mi>x</m:mi></m:mrow><m:mrow><m:mn>6</m:mn></m:mrow></m:msup><m:mo>-</m:mo><m:msup><m:mrow><m:mi>x</m:mi></m:mrow><m:mrow><m:mn>3</m:mn></m:mrow></m:msup></m:mrow></m:mrow></m:mfenced><m:mfenced open='(' close=')'><m:mrow><m:mrow><m:msup><m:mrow><m:mi>x</m:mi></m:mrow><m:mrow><m:mn>6</m:mn></m:mrow></m:msup><m:mo>+</m:mo><m:msup><m:mrow><m:mi>x</m:mi></m:mrow><m:mrow><m:mn>3</m:mn></m:mrow></m:msup></m:mrow></m:mrow></m:mfenced></m:mrow></m:math>-->