What is the difference of the polynomials? (–2x3y2 + 4x2y3 – 3xy4) – (6x4y – 5x2y3 – y5) –6x4y – 2x3y2 + 9x2y3 – 3xy4 + y5 –6x4y – 2x3y2 – x2y3 – 3xy4 – y5 –6x4y + 3x3y2 + 4x2y3 – 3xy4 + y5 –6x4y – 7x3y2 + 4x2y3 – 3xy4 – y5.