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In Exercises 14, transform the augmented matrix for the given system to reduced echelon form and, in the notation of Theorem 3, determine :1, r, and the number, n r, of independent variables. If n r > 0, then identify 11 r independent variables. \f\fIn Exercises 7-18, determine all possibilities for the solution set (from among infinitely many solutions, a unique solution, or no solution) of the system of linear equations described.\f\f\f