For what value(s) of k, if any, will the system have no solution, a unique solution, and infinitely many solutions? (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) X - 2y + 6z - 2 x + y + z = k 2x - y + 7z = k2 (a) no solution -2,1 (b) unique solution k = DNE (c) infinitely many solutions k -2,3

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