Substitute x = 4 and y = 5 into the expression: (7*4 + 3*5) / (7*4 - 3*5) = (28 + 15) / (28 - 15) = 43/13.
अभिव्यक्ति में x = 4 और y = 5 प्रतिस्थापित करें: (7*4 + 3*5) / (7*4 - 3*5) = (28 + 15) / (28 - 15) = 43/13।