mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="12px"><msup><mfenced><mfrac><mrow><mi mathvariant="normal">x</mi><mo>+</mo><mn>7</mn></mrow><mn>3</mn></mfrac></mfenced><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msup></mstyle></math>