Solve the system 21 X2 = I3 X4 4x₁5x₂ + 3x3 +3x4 +₂ +3x3 +2x4 3x₁4x2 +6x3 +5x4 -2x₁ +2x₂ +63 +4x4 -I1 +8 +t - - || = 0 1 12

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