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Neuron
If you would like to know how much is 4 3/9 + 6 5/7, you can calculate this using the following steps:

4 3/9 + 6 5/7 = 39/9 + 47/7 = 273/63 + 423/63 = (273 + 423) / 63 = 696/63 = 232/21 = 11 1/21

The correct result would be 11 1/21.