mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>=</mo><mfenced separators="|"><mrow><mn>2</mn><mi mathvariant="normal">m</mi><mo>+</mo><mi mathvariant="normal">b</mi></mrow></mfenced><mo>=</mo><mfenced separators="|"><mrow><mn>2</mn><mo>&#xD7;</mo><mfrac><mi mathvariant="normal">m</mi><mi mathvariant="normal">b</mi></mfrac><mo>+</mo><mn>1</mn></mrow></mfenced><mo>=</mo><mfenced separators="|"><mrow><mn>2</mn><mo>&#xD7;</mo><mfrac><mn>7</mn><mn>2</mn></mfrac><mo>+</mo><mn>1</mn></mrow></mfenced><mo>=</mo><mfenced separators="|"><mrow><mn>7</mn><mo>+</mo><mn>1</mn></mrow></mfenced><mo>=</mo><mn>8</mn></math>