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= 4 - 2a + 6b + 5a + 3b - 2
= 2 + 3a + 9b
= 4 - 2(a + 3b) + 5a + 3b - 2
= 4 - 2a + 6b + 5a + 3b - 2
= 2 + 3a + 9b