It sounds as if you are confusing this with a system of equations, where you can use one equation to eliminate a variable in another. Here you have only one equation, and the answer will be an expression containingbandc.

Have you tried doing what was suggested? You have 2a = ab + c, which is better than the original becauseais not in the denominator. Now you have to gather terms withaon one side, and then, as I hinted, factoraout of two terms, so that there is only oneain the equation.

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