If you add the 2nd and 3rd equations together, the "a" terms will drop out. That leaves you with one equation in two unknowns. Now, can you figure out what to do with 1st equation so that you can combine it with either the 2nd or 3rd equation and have the "a" term drop out after that manipulation. That gives you two equations in two unknowns (b and c) and you can certainly solve that. After finding the values of b and c, substitute those values back into one of the original equations and solve for a.
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