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This questions are easy to solve. First you should simplify each side. When you do that you will get 78=a6. Now all you need to do is isolate the variable in one side. In this case you would need to divide both sides by 6 to isolate a. When you do that you will get 13=a and because it is more common to put the variable to the left side, you should write it as a=13. Now we're finish, we now know the value of a.