To simplify the expression, we need to combine like terms:

(4xy/2 - x + 2x/2y) - (2xy/2 + 3x + 2x/2y)
= 2xy - x + x/y - xy + 3x - x/y
= 2xy - xy - xy - x + 3x
= 4x - 2xy

Therefore, the simplified expression is 4x - 2xy.