x, y,and zare integers, and . If the sum of and is , what is the value of x?

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x, y,and zare integers, and <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04635.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mn>7</m:mn><m:mo>></m:mo><m:mi>x</m:mi><m:mo>></m:mo><m:mi>y</m:mi><m:mo>></m:mo><m:mi>z</m:mi><m:mo>></m:mo><m:mn>1</m:mn></m:mrow></m:math>-->. If the sum of <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04636.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:msup><m:mrow><m:mi>z</m:mi></m:mrow><m:mrow><m:mn>2</m:mn></m:mrow></m:msup></m:mrow></m:math>--> and <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04637.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:msup><m:mrow><m:mi>y</m:mi></m:mrow><m:mrow><m:mn>2</m:mn></m:mrow></m:msup></m:mrow></m:math>--> is <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04638.png'/><!--<m:math display='inline' 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>2</m:mn></m:mrow></m:msup></m:mrow></m:math>-->, what is the value of x?