Solve the system of equations.
3x + 4y + 4z = 4
5x + 7y + 3z = 5
4x + 5y + 72 = 7
a. (x = 10, y = - 7, z = 2)
b. (x = 7, y = - 4, 2 = 1)
c. (x = 8, y = - 5,2 = 0)
d (x = 9, y = - 6,2=-1)
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