d x3 in terms of t.) X1 + 0.5x2 + 0.33x3 + 0.25x4 0.5x1 + 0.33x2 + 0.25x3 + 0.21x4 = -1.7 0.33x1 + 0.25x2 + 0.2x3 + 0.17×4 = -0.3 0.25x1 + 0.2x2 + 0.17x3 + 0.14x4 = -6.4 0.3 1' X2, X3, Xq)

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