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It is not possible to answer the question as the value of a is not known, if the value of a was known, for example 2, you could answer as 6a would be 2x6 which is 12 plus 4 giving a total of 16

until the value of a is known the most correct solution, including the brackets, would be (6a+4)

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13y ago

What else can I help you with?