I only need help on part C. I know exactly how to solve it, however, I do not understand what happened to the minus signs as shown in the markscheme | Cheap Nursing Papers

I only need help on part C. I know exactly how to solve it, however, I do not understand what happened to the minus signs as shown in the markscheme

I only need help on part C. I know exactly how to solve it, however, I do not understand what happened to the minus signs as shown in the markscheme and also how they flipper the numerator and denominator.

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