Simplify -2y^3-y^2+y^2+y^3

$- 2 y^{3} - y^{2} + y^{2} + y^{3}$

Combine the opposite terms in $- 2 y^{3} - y^{2} + y^{2} + y^{3}$ .

Add $- y^{2}$ and $y^{2}$ .

$- 2 y^{3} + 0 + y^{3}$

Add $- 2 y^{3}$ and $0$ .

$- 2 y^{3} + y^{3}$

Add $- 2 y^{3}$ and $y^{3}$ .

$- y^{3}$