Simplify (-2x^3+x^2+x-3)+(5x^3+x^2-x)

$(- 2 x^{3} + x^{2} + x - 3) + (5 x^{3} + x^{2} - x)$

Remove parentheses.

$- 2 x^{3} + x^{2} + x - 3 + 5 x^{3} + x^{2} - x$

Combine the opposite terms in $- 2 x^{3} + x^{2} + x - 3 + 5 x^{3} + x^{2} - x$ .

Subtract $x$ from $x$ .

$- 2 x^{3} + x^{2} - 3 + 5 x^{3} + x^{2} + 0$

Add $- 2 x^{3} + x^{2} - 3 + 5 x^{3} + x^{2}$ and $0$ .

$- 2 x^{3} + x^{2} - 3 + 5 x^{3} + x^{2}$

Add $- 2 x^{3}$ and $5 x^{3}$ .

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

Add $x^{2}$ and $x^{2}$ .

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