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xy + xz - 2yz - 2xy + 3xz - yz
-xy + 4xz - 3yz
Respuesta :
-xy + 4xz - 3yz
(xy + xz - 2yz) + (- 2xy + 3xz - yz)
xy + xz - 2yz - 2xy + 3xz - yz
xy - 2xy + xz + 3xz - 2yz - yz
- xy + 4xz - yz