1. On this reading the hardest part for me was understanding the inverse of a modulus. Also, I don't know how to find all the numbers that satisfy a given modular equation. For example, see pg. 74, the example at the bottom of the page.
2. The fact that fractions exist and make sense in modular arithmetic is amazing! The only tricky part is making sure it makes sense to divide the remainder by a given number. I also am a huge fan of the extended Euclidean algorithm because it saves tons of time.
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