Given that A is transformed into U by the elementary row operations below, find L. -31 2R1+R2→R2 4 4 1 -3 4 1 1 -3 3R1+R3+R3 A = -8 -9 4 -8 -9 -7 -2 = U -12 -3 4 -5 -5 Ex: 42 L

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