Given that this system of equations is true, what is the value of x?

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Given that this system of equations is true, what is the value of x? <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04493.png'/><!--<m:math display='block' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mtable columnalign='left'><m:mtr><m:mtd><m:msup><m:mrow><m:mi>x</m:mi></m:mrow><m:mrow><m:mn>2</m:mn></m:mrow></m:msup><m:mo>-</m:mo><m:mn>2</m:mn><m:mi>x</m:mi><m:mo>-</m:mo><m:mn>8</m:mn><m:mo>=</m:mo><m:mn>0</m:mn></m:mtd></m:mtr><m:mtr><m:mtd><m:msup><m:mrow><m:mi>x</m:mi></m:mrow><m:mrow><m:mn>2</m:mn></m:mrow></m:msup><m:mo>-</m:mo><m:mn>16</m:mn><m:mo>=</m:mo><m:mn>0</m:mn></m:mtd></m:mtr></m:mtable></m:math>-->