3) 4) 1 x-y + 2z - w = -1 2x + y2z2w = -2 -x + 2y4z + w = 1 3x3w=-3 1₁ 21₁-12 + 313 + 4/4 = 9 213 + 714 = 11 31₁ 312 +13 + 514 = 8 21₁ + 1₂ +413 + 4/4 = 10

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