5. If a can be chosen from the set (2, 3, 6, 9), b can be chosen from the set (4, 5, 6, 7), and c can be chosen from the set (1, 2, 4, 5), what values of a, b, and c will produce the largest solution for the equation ax + b = c? What values of a, b, and c will produce the smallest solution?