Let x₁, x2 be the unknown coordinates of an object. We use four noisy sensors that give us the following readings: x₁ = 1.5, x2 = 1.5, x₁ + x2 = 3.1, x₁ - x2 = -0.9. What is the best possible estimate of x₁, x2? (in the sense of the Euclidean norm).

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