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= m² - 3m² + 2m - m + 3 + 8
= -2m² + m + 11
(12x² + xy + 2y²) - (7x² - 3xy - y)
= 12x² - 7x² + xy + 3xy + 2y² + y²
= 5x² + 4xy + 3y²
(a² - 4ab) + (-5a² + 3ab)
= a² - 5a² - 4ab + 3ab
= -4a² - ab