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=> 3b(2a + c) - 2a(3 - 2b) - 3bc + 2a
=> 6ab + 3bc - 6a + 4ab - 3bc + 2a
=> 6ab + 4ab + 3bc - 3bc - 6a + 2a
=> 10ab - 4a ---> Faktorkan dengan 2a
=> 2a(5b - 2)
= 6ab + 3bc - 6a + 4ab - 3bc + 2a
= 10ab + 6bc - 4a