Simplify -2ab^2+3ab-2ab^2+4a^2b-5ab+3a^2b

$- 2 a b^{2} + 3 a b - 2 a b^{2} + 4 a^{2} b - 5 a b + 3 a^{2} b$

Subtract $2 a b^{2}$ from $- 2 a b^{2}$ .

$- 4 a b^{2} + 3 a b + 4 a^{2} b - 5 a b + 3 a^{2} b$

Subtract $5 a b$ from $3 a b$ .

$- 4 a b^{2} - 2 a b + 4 a^{2} b + 3 a^{2} b$

Add $4 a^{2} b$ and $3 a^{2} b$ .

$- 4 a b^{2} - 2 a b + 7 a^{2} b$