\[- xt\left( x^{2}t^{2} - xt - 3 \right) \cdot p =\]
\[= - xtp\left( x^{2}t^{2} - xt - 3 \right) =\]
\[= - x^{3}t^{3}p + x^{2}t^{2}p + 3xtp\text{.\ }\]