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Verified answer
[tex]a + ( {x}^{2} + {y}^{2} + xy) = 2 {x}^{2} + 3xy[/tex]
[tex]a = {2x}^{2} + 3xy -( {x}^{2} + {y}^{2} + xy)[/tex]
[tex]a = {2x}^{2} + 3xy - {x}^{2} - {y}^{2} - xy[/tex]
[tex]a = 2 {x}^{2} - {x}^{2} + 3xy - xy - {y}^{2} [/tex]
[tex]a = {x}^{2} - {y}^{2} + 2xy[/tex]
Answer:
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