C1 X2 3 || ts 4x1 -X1 3x1 31 2 -5x2 +3x3 +2x4 = +2 +33 +3x4= 2 -4x2 +6x3 +5x4= 4 -9x3 -9x4= -6 -32

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A: topic - inverse of matrix