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Neuron
If you would like to calculate 1 1/3 + 1 3/7, you can do this using the following steps:

1 1/3 + 1 3/7 = 4/3 + 10/7 = 28/21 + 30/21 = (28 + 30) / 21 = 58/21 = 2 16/21

The correct result would be 2 16/21.
1 + 1 = 2

1/3 3/7 can be made equilavent by multiplying

1/3 equals 7/21
3/7 equals 9/21

Added equals 16/21

So the answer is 2 16/21

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