2ab - 3ab = 5ab
5ab - 2ab = 3ab
- 4a + 6a = 2a
2a + 1a = 3a
- 8b - 4b =12b
12b + 3b = 9b
-7 - 11 = 18
-18 + 5 = 13
Answer is 3ab+ 3a-9b-13
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