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- 3a + 5b = 16
- 4a + 7b = 30
- 12a + 20b = 64
- 12a + 21b = 90
- 21b - 20b = 90 - 64
- b = 26
- 3a + 5*26 = 16
- 3a = 16 - 130 = -114
- a = -38
- a + b = -38 + 26 = -12
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