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= 5a + 4xy + 2y + 3z - 4a + 3xy + 3z
= a + 7xy + 2y + 6z
(4b - 2mn + 4x) - (4mn - 6b + 2x)
= 4b - 2mn + 4x - 4mn + 6b - 2x
= 10b - 6mn + 2x
(5x + 2y + 3z)(3x - 4y)
= 15x² + 6xy + 9xz - 20xy - 8y² - 12yz
= 15x² + 9xz - 14xy - 8y² - 12yz
(3x² + 2y)(5x - 3y)
= 15x³ + 10xy - 9x²y - 6y²