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Find the inverse of

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Please help with these problems. See attached file for full problem description.

1. Find

2. a) Find the inverse of: .

b) Use it to solve the following system of equations:
2x1 + x2 + x3 = 4
x2 + 2x3 = 0
2x1 + 2x2 + x3 = 1.

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