What is (3x) + (5x)?, 8x, 15x, 2x, 5x2, What is (7a) - (2a)?, 9a, 5a, 7a2, -5a2, What is (4y2) + (6y2)?, 10y2, 24y2, 2y2, 10y, What is (9x) - (4x)?, 5x, 13x, -5x, 5x2, What is (2a2) + (3a2)?, 6a2, 5a2, 5a, 1a2.

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