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= (-3 x a) - (-3 x -2b)
= -3a - 6b
2. (3a + 6) x (2a - b)
= 6a - 3ab + 12a - 6b
= 6a + 12a - 3ab - 6b
= 18a - 3ab - 6b
3. 2 x (ab + b - 3c)
= 2ab + 2b - 6c