Simplify 6y+3+3x^2-y^2-5x+2x^2+3x+2y

$6 y + 3 + 3 x^{2} - y^{2} - 5 x + 2 x^{2} + 3 x + 2 y$

Add $6 y$ and $2 y$ .

$3 + 3 x^{2} - y^{2} - 5 x + 2 x^{2} + 3 x + 8 y$

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

$3 + 5 x^{2} - y^{2} - 5 x + 3 x + 8 y$

Add $- 5 x$ and $3 x$ .

$3 + 5 x^{2} - y^{2} - 2 x + 8 y$

Move $3$ .

$5 x^{2} - y^{2} - 2 x + 8 y + 3$