Question: Solve the set of equations by matrix inversion. If available, use Mathematica to invert the matrix: 2x 1 + 4x 2 + x 3 =

Solve the set of equations by matrix inversion. If available, use Mathematica to invert the matrix:
2x₁ + 4x₂ + x₃ = 40,
x₁ + 6x₂ + 2x₃ = 55,
3x₁ + x₂ + x₃ = 23.

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