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Neuron
If you would like to calculate 2 3/5 - 1 3/8, you can do this using the following steps:

2 3/5 - 1 3/8 = 13/5 - 11/8 = 104/40 - 55/40 = (104 - 55) / 40 = 49/40 = 1 9/40

The correct result would be 1 9/40.