mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mfenced><mrow><mn>2</mn><mi mathvariant="normal">x</mi><mo>+</mo><mn>12</mn></mrow></mfenced><mfenced><mrow><mn>3</mn><mi mathvariant="normal">x</mi><mo>+</mo><mn>12</mn></mrow></mfenced></mfrac><mo> </mo><mo>=</mo><mo> </mo><mfrac><mn>11</mn><mn>15</mn></mfrac></math>