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Solve the following system of equations by using matrices.

x-2y=-6
2y-z=1
x+3z=7

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Take a look here:

http://www.wolframalpha.com/input/?i=%7B%7B1,-2,0%7D,%7B0,2,-1%7D,%7B1,0,3%7D%7D*%7B%7Bx%7D,%7By%7D,%7Bz%7D%7D+%3D+%7B%7B-6%7D,%7B1%7D,%7B7%7D%7D

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