Question: i substituted x3 = 0 into x1 + 4x2 - 7(0) =2, then got x2 = 2, then substituted x3=0 and x2=2 into x1 +

i substituted x3 = 0 into x1 + 4x2 - 7(0) =2, then got x2 = 2, then substituted x3=0 and x2=2 into x1 + 5x2 +2x3 = -6 and got x1 = 4

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