(5x + 2x) * 14 = 294

7x * 14 = 294

98x = 294

x = 294 / 98

x = 3

(12y - 5y) / 4 = 21

7y / 4 = 21

7y = 84

y = 84 / 7

y = 12

Therefore, x = 3 and y = 12.