Solve the following equation for x, y, and z: x ? y + z = ?1 ?x + y + z = ?1 x + 2y ? 2z = 5

A. x = ?1, y = 1, z = 1 B. x = ?2/3, y = ?2/3, z = ?1 C. x = 5/3, y = 7/6, z = ?1/2 D. x = 1, y = 1, z = ?1