Simplify -3y+7y+4y^3-2y^2+6y^3-7y^3-5y

$- 3 y + 7 y + 4 y^{3} - 2 y^{2} + 6 y^{3} - 7 y^{3} - 5 y$

Add $- 3 y$ and $7 y$ .

$4 y + 4 y^{3} - 2 y^{2} + 6 y^{3} - 7 y^{3} - 5 y$

Subtract $5 y$ from $4 y$ .

$4 y^{3} - 2 y^{2} + 6 y^{3} - 7 y^{3} - y$

Add $4 y^{3}$ and $6 y^{3}$ .

$10 y^{3} - 2 y^{2} - 7 y^{3} - y$

Subtract $7 y^{3}$ from $10 y^{3}$ .

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