Find the sum:
1. (-5x - 4) + (5x - 7)
2. (4x2 + 12xy + 7y2) + (7x2 + xy - 6y2)
Find the difference.
1. (8x + 4y) - (3x - y)
2. (4abc - 19ab2c + 9a2bc - 23abc?) - (10abc + 30abc - 43abc)​

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