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1. (4x + 5) + (6x + 3)


2. (x3 + 7x2 + x) + (2x2 - 4x - 12)


3. (8x + 4) + (-11x + 5)


4. (3a2 + 2a - 2) - (3a + 7)


5. (4x2 + x - 9) - (3x2 + 7x + 3)​