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= -2m + 3
b. 2a² + 3ab - 7 - 5a² + 2ab - 4 = 2a² - 5a² + 3ab + 2ab - 7 - 4
= -3a² +5ab - 11
c. 4x² -3xy + 7y -5x² + 2xy - 4y = 4x² - 5x² -3xy + 2xy + 7y - 4y
= -x² - xy +3y
d. -4p² - 3pg -2 - 6p² + 8pg -3 = -4p² - 6p² - 3pg + 8pg - 2 - 3
= -10p² + 5pg -5