Verified Answer :

anaiswarren

The answer is C

1\(A=\frac{x+y+z}{3}\)

2.\(3(A)=3 (\frac{x+y+z}{3} )\)

3.\(-z=3A+x+y\)

4\(\frac{-z}{-1} = \frac{3A+x+y}{-1}\)

5.\(z=-3A-x-y\)

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