(16-х)÷13 4/7=7/9:10 5/9;

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To simplify this expression, first convert the mixed numbers to improper fractions.

16 - (13*7) / 7 = (112 - 91) / 7 = 21 / 7 = 3

Next, convert 4/7 to an improper fraction:

4/7 = (4*7 + 1) / 7 = 29 / 7

To divide by the fraction 7/9, we multiply by its reciprocal (9/7):

3 * (9 / 7) = 27 / 7

Finally, multiply by the fraction 10 5/9:

27 / 7 (10 + 5/9) = 27 / 7 ((90 + 5) / 9) = 27 / 7 (95 / 9) = (27 95) / (7 * 9) = 2565 / 63

Therefore, the answer is 2565 / 63.