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A) (-3x) x (-3x) x (-3x) = -27x(3)
B) 2p - pq + 4qp + 5q + 3 = 2p + 3qp + 5q + 3
C) 3 - 2x + 3x² - 5x - 7 = -4 -7 + 3x²
D) 2x + 5y² - 3x - 5y² + 5 = -x + 5
E) 2x + 5y - 3 + 5x + 2xy + 2 = 7x + 5y - 1 + 2xy