Simplify -10x^2-x+6+10x^2-5

$- 10 x^{2} - x + 6 + 10 x^{2} - 5$

Combine the opposite terms in $- 10 x^{2} - x + 6 + 10 x^{2} - 5$ .

Add $- 10 x^{2}$ and $10 x^{2}$ .