The given terms are
![\begin{gathered} 3,3 \\ x^3 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/ebwlx6msktkbla2remo6poo1yri0z4fd5i.png)
Notice that these terms are not like terms because one has variable and the other one doesn't.
Remember that like terms are those terms that have the same variable with the same exponent.
Therefore, the given terms are unlike terms.