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5x - 7y + 8
- 4x - y + 6
- 3x +8y + 9
--------------------
- 2x + 0 + 23
Respuesta.
- 2x + 23
-4x -y +6
-3x+8y+9
""""""""""""":
-2x+0y+23
Rpta: -2x+23