https://www.khanacademy.org/math/algebra-home/alg-basic-eq-ineq/alg-old-school-equations/v/algebra-linear-equations-1
https://www.khanacademy.org/math/algebra-home/alg-basic-eq-ineq/alg-old-school-equations/v/algebra-linear-equations-3
Homework: Exercise 5.1 (page 119) # 1 (all) #2 (e – h)
Challenge Yourself! #2 (all)
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