Solve the system of equations.

3x + 2y + 4z = 7

4x + 3y + 5z = 9

7x + 4y + 7z = 5

a (x = - 5, y = 3,2 = 4)

b. (x = - 6, y = 4, z = 5)

c. (x = - 3, y = 1, z = 6)

d. (x = - 4, y = 2, z = 3)

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