12. Determine the values of A such that the system has a) a unique solution b) no solution c) more than one solution d) Find solutions. (2x1 + x2 + 3x3 +2x4 = 3 4.x1 + 3x2 + 6x3 + 4x4 = 5 6x1 + 5x2 + 9x3 + 6x4 = 7 Ax1 + 7x2 + 12x3 + 8x4 = 9

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