Simplify -3x^2+2y^2+5xy-2y+5x^2-3y^2

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

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

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