What is the (unique) solution to the system when all the non-basic variables are set to 0 once in reduced echelon form. X1 E- X2 X3 X4 || -X1 4x1 3x1 2x1 +x2 -5x2 -4x2 +6x3 -2x2 - 6x3 +3x3 +2x4 = +3x3 +2x4= +4x4 = 4x4 = 4 1 5 -8

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