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It's just a kind of way it's written. Imagine - as (-1). So it becomes:

- 3/2 = (-1) x 3/2 = -3/2

The negative sign (-) will always just multiply with the numerator (the 3 in this case).

The reason it's usually used is that it makes the equation look better, since all the + and - signs are in between the numbers rather than having one next to the numerator and looking awkward.

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12y ago

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