What's the difference between 7 / 15 divided by 2 / 3 divided by 3 / 4 and the starting number? Why

The result is still 7 / 15, because the original formula = 7 / 15 * 3 / 2 * 4 / 3 * 1 / 2 = 7 / 15 * 1 = 7 / 15

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