Respuesta :

Add 19x and x to get 20x.20x−y−2z+5y+2zAdd −y and 5y to get 4y.20x+4y−2z+2zAdd −2z and 2z to get 0.20x+4y+0Add 20x and 0 to get 20x.20x+4y





hope i helped best of luck :)