2 (y - 1) + 3(y + 2) + 6y =3z + 4 (z + 2) + 4z =9 (a - 1) + 3a + 2 (a + 1) =7 (b + 2) - 5b + 6 (b + 1) + 9 = - 6c + 3 (c + 1) + 7c =Por fis ayudenme : (?
2 (y - 1) + 3(y + 2) + 6y = 3z + 4 (z + 2) + 4z = 9 (a - 1) + 3a + 2 (a + 1) = 7 (b + 2) - 5b + 6 (b + 1) + 9 = - 6c + 3 (c + 1) + 7c = Por fis ayudenme : (.