mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced separators="|"><mrow><mfrac><mrow><mi mathvariant="normal">x</mi><mo>+</mo><mn>1</mn></mrow><mi mathvariant="normal">x</mi></mfrac><mo>-</mo><mn>1</mn></mrow></mfenced><mo>+</mo><mfenced separators="|"><mrow><mfrac><mi mathvariant="normal">x</mi><mrow><mi mathvariant="normal">x</mi><mo>+</mo><mn>1</mn></mrow></mfrac><mo>-</mo><mn>1</mn></mrow></mfenced><mo>=</mo><mfrac><mn>13</mn><mn>6</mn></mfrac><mo>-</mo><mn>2</mn><mspace linebreak="newline"/><mo>&#x21D2;</mo><mi mathvariant="normal">&#xA0;</mi><mfrac><mrow><mi mathvariant="normal">x</mi><mo>+</mo><mn>1</mn><mo>-</mo><mi mathvariant="normal">x</mi></mrow><mi mathvariant="normal">x</mi></mfrac><mo>+</mo><mfrac><mrow><mi mathvariant="normal">x</mi><mo>-</mo><mi mathvariant="normal">x</mi><mo>-</mo><mn>1</mn></mrow><mi mathvariant="normal">x</mi></mfrac><mo>=</mo><mfrac><mn>1</mn><mn>6</mn></mfrac><mspace linebreak="newline"/><mo>&#x21D2;</mo><mi mathvariant="normal">&#xA0;</mi><mfrac><mn>1</mn><mi mathvariant="normal">x</mi></mfrac><mo>+</mo><mfenced separators="|"><mfrac><mrow><mo>-</mo><mn>1</mn></mrow><mrow><mi mathvariant="normal">x</mi><mo>+</mo><mn>1</mn></mrow></mfrac></mfenced><mo>=</mo><mfrac><mn>1</mn><mn>6</mn></mfrac><mspace linebreak="newline"/><mo>&#x21D2;</mo><mi mathvariant="normal">&#xA0;</mi><mfrac><mn>1</mn><mi mathvariant="normal">x</mi></mfrac><mo>-</mo><mfrac><mn>1</mn><mrow><mi mathvariant="normal">x</mi><mo>+</mo><mn>1</mn></mrow></mfrac><mo>=</mo><mfrac><mn>1</mn><mn>6</mn></mfrac><mspace linebreak="newline"/><mo>&#x21D2;</mo><mi mathvariant="normal">&#xA0;</mi><mfrac><mrow><mi mathvariant="normal">x</mi><mo>+</mo><mn>1</mn><mo>-</mo><mi mathvariant="normal">x</mi></mrow><mrow><mi mathvariant="normal">x</mi><mo>(</mo><mi mathvariant="normal">x</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow></mfrac><mo>=</mo><mfrac><mn>1</mn><mn>6</mn></mfrac><mspace linebreak="newline"/><mo>&#x21D2;</mo><mi mathvariant="normal">&#xA0;</mi><mfrac><mn>1</mn><mrow><mi mathvariant="normal">x</mi><mo>(</mo><mi mathvariant="normal">x</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow></mfrac><mo>=</mo><mfrac><mn>1</mn><mn>6</mn></mfrac></math>