Nine Chapters on Mathematical Art, Vol. 1

How much is subtracted from each to equalize them?

Answer: Reduce 2/3 by 1, and 3/4 by 4. Combine these amounts to add to 1/2, so that each is equal to 23/36.

Equalization

We, Chunfeng and others, respectfully note: In equalization, one observes the discrepancies among various fractions. Wishing to make them uniform, one subtracts from the larger and adds to the smaller. Hence it is called "Equalization."
To divide.

Procedure

Cross-multiply the denominators with the numerators to make their numerators uniform, and sum the products to form the "equalizing dividend" We, Chunfeng and others, respectfully note: The denominators are cross-multiplied with the numerators and summed to form the equalizing dividend.
Multiply the denominators together to determine the fixed limit for this equalizing dividend, governing the extent to which the many numerators should be decreased or increased, establishing the limit for equalization.
This becomes the divisor to uniform the numerators and also equate the denominators, then multiply the values not yet summed by the listed numbers.