If x : y = 3 : 4, then find (7x + 3y) : (7x - 3y).

x=3, y=4 प्रतिस्थापित करें: (7*3 + 3*4) / (7*3 - 3*4) = (21 + 12) / (21 - 12) = 33 / 9 = 11 / 3।