For what value of a if any will the following system...

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For what value of a, if any, will the following system of equations in x, y and z have a solution?
2x + 3y = 4; x + y + z = 4; x + 2y - z = a

A. Any real number

B. 0

C. 1

D. There is no such value

Answer: Option B

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