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= 5p - 3q - r - p - 2q + 3r
= 5p - p - 3q - 2q - r + 3r
= 4p - 5q + 2r
(x² - 3x + 8) + (-x² - 3x)
= x² - 3x + 8 - x² - 3x
= x² - x² - 3x - 3x + 8
= -6x + 8