Given a mathematical expression, simplify it.
3x + 4xy + y - 2x - 3y
4xy + (3x - 2x) + (y - 3y) = 4xy + x - 2y
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Given a mathematical expression, simplify it.

### Response:
4xy + (3x - 2x) + (y - 3y) = 4xy + x - 2y