Combine like terms.I need help of these can you help me?

Given:
an expression is given as below
[tex]2y^3-4x^2-4-1+3x^2-3y^3-y^3[/tex]Find:
we have to combine like terms.
Explanation:
we will combine like terms as follows
[tex]\begin{gathered} 2y^3-4x^2-4-1+3x^2-3y^3-y^3=y^3(2-3-1)+x^2(-4+3)-4-1 \\ =-2y^3-x^2-5 \end{gathered}[/tex]Therefore, the answer is
[tex]-2y^3-x^2-5[/tex]