mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="12px"><mrow><mfrac><mn>50</mn><mn>100</mn></mfrac><mfenced separators="|"><mrow><mi mathvariant="normal">p</mi><mo>-</mo><mi mathvariant="normal">q</mi></mrow></mfenced><mo>=</mo><mfrac><mn>30</mn><mn>100</mn></mfrac><mfenced separators="|"><mrow><mi mathvariant="normal">p</mi><mo>+</mo><mi mathvariant="normal">q</mi></mrow></mfenced></mrow></mstyle></math>