https://www.khanacademy.org/math/algebra-basics/basic-alg-foundations/alg-basics-fractions/v/adding-fractions-with-different-signs
https://www.khanacademy.org/math/algebra-basics/basic-alg-foundations/alg-basics-fractions/v/multiplying-negative-and-positive-fractions
https://www.khanacademy.org/math/algebra-basics/basic-alg-foundations/alg-basics-fractions/v/examples-of-dividing-negative-fractions
Homework: Exercise 2.5 (page 55) #1 – 4
Challenge yourself #5 (optional)
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