https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/complicated_equations/v/multi-step-equations
https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/complicated_equations/v/equations-with-variables-on-both-sides
Homework: Exercise 5.2 (page 122) #1 (all) #2 (a – c)
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