2x+2y+x2-y2x+y=?

2x+2y+x2-y2x+y=? Correct Answer x-y+2

<math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mrow><mn>2</mn><mi>x</mi><mo> + </mo><mn>2</mn><mi>y</mi><mo> + </mo><msup><mi>x</mi><mn>2</mn></msup><mo> - </mo><msup><mi>y</mi><mn>2</mn></msup></mrow><mrow><mi>x</mi><mo> + </mo><mi>y</mi></mrow></mfrac><mspace linebreak = "newline"/><mo> = </mo><mfrac><mrow><mn>2</mn><mfenced><mrow><mi>x</mi><mo> + </mo><mi>y</mi></mrow></mfenced><mo> + </mo><mfenced><mrow><mi>x</mi><mo> + </mo><mi>y</mi></mrow></mfenced><mfenced><mrow><mi>x</mi><mo> - </mo><mi>y</mi></mrow></mfenced></mrow><mfenced><mrow><mi>x</mi><mo> + </mo><mi>y</mi></mrow></mfenced></mfrac><mspace linebreak = "newline"/><mo> = </mo><mfrac><mrow><mfenced><mrow><mi>x</mi><mo> + </mo><mi>y</mi></mrow></mfenced><mstyle displaystyle = "true"><mfenced><mrow><mi>x</mi><mo> - </mo><mi>y</mi><mo> + </mo><mn>2</mn></mrow></mfenced></mstyle></mrow><mfenced><mrow><mi>x</mi><mo> + </mo><mi>y</mi></mrow></mfenced></mfrac><mspace linebreak = "newline"/><mo> = </mo><mi>x</mi><mo> - </mo><mi>y</mi><mo> + </mo><mn>2</mn></math>[Answer is not given in the choice]