mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">x</mi><mo> </mo><mfenced><mrow><mfrac><mn>1</mn><mn>36</mn></mfrac><mo> </mo><mo>+</mo><mo> </mo><mfrac><mn>1</mn><mn>42</mn></mfrac></mrow></mfenced><mo> </mo><mo>=</mo><mo> </mo><mfrac><mi mathvariant="normal">x</mi><mn>20</mn></mfrac></math>