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Can someone explain how we factorized here to get the 2 and where does the -3 come from in the last part?

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>Can someone explain how we factorized here to get the 2

It's not factorization, it's simplification:

3/2 - 1 = 1/2

And dividing by 1/2 is the same as multiplying by 2

>and where does the -3 come from in the last part?

It comes from distributing the 2 inside the outer parenthesis. 2\*-1 = -2, then you subtract the 1 which makes it -3.
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The denominator in the first term, in the first equation, is 3/2 - 1 = 1/2.

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