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b. 6a-5b-2c-8a+6b+9c= -2a+b+7c
5a + 8 + 8a + 3 = 5a + 8a + 8 + 3 = 13a + 11
b.
6a + 5b - 2c + - 8a + 6b + 9c = 6a - 8a - 5b + 6b - 2c + 9c = -2a + b + 7c