https://www.khanacademy.org/math/in-sixth-grade-math/integers-india/subtraction-integers-number-line/v/why-subtracting-a-negative-equivalent-to-adding-a-positive
https://www.khanacademy.org/math/in-sixth-grade-math/integers-india/subtraction-integers-number-line/v/adding-and-subtracting-negative-number-examples
Homework: Exercise 2.3 (page 43) # 1 – 6
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