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12a-5=9a-2

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You have an unknown variable, a, that you are looking to solve for. To do so, you need to isolate all terms with the variable a to one side of the equation and move all other terms to the other side of the equation. Then combine all like terms and solve for a:

12a - 5 = 9a - 2     »»»   12a - 5 - 9a + 5 = 9a - 2 - 9a + 5

   »»»   12a - 9a = - 2 + 5   »»»   3a = 3

   »»»   (3a)/3 = (3)/3   »»»   a = 1

 

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