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1. 2x + 4y
3x + 5y
5x + 9y
4. 2a - 3b + 7
1a + 5b + 2
-3a + 4b - 1
6b + 8
II. Subtraction (Rule of Subtraction: Change the signs of the subtrahend, then proceed to addition.)
2. 5x + 3y
+ 4x + 6y
9x + 9y
3. 4m - 13n + 8
+ -2m - 5n + 4
2m - 18n +12