[tex]5xy - {x}^{2} t + 2xy + 3 {x}^{2}t \\ \\ 1. \: (5 xy + 2xy) + ( - {x}^{2} t + 3 {x}^{2} t) \\ 2. \: 7xy + 2 {x}^{2} t[/tex]
