Explicación paso a paso:
[tex](3 {x}^{3} y + 2 {x}^{2} {y}^{2} - 3x {y}^{3} ) + ( - 9 {x}^{3} y - 7 {x}^{2} {y}^{2} - 2x {y}^{3} ) \\ 3 {x}^{3} y + 2 {x}^{2} {y}^{2} - 3x {y}^{3} - 9 {x}^{3} y - 7 {x}^{2} {y}^{2} - 2x {y}^{3} \\ - 6 {x}^{3} - 5 {x}^{2} {y}^{2} - 5x {y}^{3} \\ resp[/tex]
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Explicación paso a paso:
[tex](3 {x}^{3} y + 2 {x}^{2} {y}^{2} - 3x {y}^{3} ) + ( - 9 {x}^{3} y - 7 {x}^{2} {y}^{2} - 2x {y}^{3} ) \\ 3 {x}^{3} y + 2 {x}^{2} {y}^{2} - 3x {y}^{3} - 9 {x}^{3} y - 7 {x}^{2} {y}^{2} - 2x {y}^{3} \\ - 6 {x}^{3} - 5 {x}^{2} {y}^{2} - 5x {y}^{3} \\ resp[/tex]