Updates are x₁(new)=2−2x₂(old)−x₃(old), x₂(new)=1−x₃(old), x₃(new)=2−x₁(old)−x₂(old). First iterate is (2,1,2); using all these old values simultaneously gives second iterate (−2,−1,−1). Absolute sum = **4**.
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