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(- 4x + 15y + 16z) + (- 13x + 20y) - (x + y + z)
- 4x + 15y + 16z - 13x + 20y - x - y + z
- 4x - 13x - x + 15y + 20y - y + 16z + z
- 18x + 35y - y + 17z
- 18x + 34y + 17z
Respuesta.
- 18x + 34y + 17z