What is 3x-2y-4xy 4y-1x 7xy?

To simplify the expression (3x - 2y - 4xy + 4y - 1x + 7xy), first combine like terms. Group the (x) terms: (3x - 1x = 2x), the (y) terms: (-2y + 4y = 2y), and the (xy) terms: (-4xy + 7xy = 3xy). This results in the simplified expression: (2x + 2y + 3xy).