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First, find the solutions x for det(A - xI) = 0, where I is the identity matrix and x is a variable. The solutions x are your eigenvalues. Let's say that a, b, c are your eignevalues. Now solve the systems [A - aI | 0], [A - bI | 0], [A - cI | 0]. The basis of the solution sets of these systems are the eigenvectors.

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