https://www.khanacademy.org/math/algebra-basics/core-algebra-linear-equations-inequalities/core-algebra-linear-inequalities/v/inequalities-using-addition-and-subtraction
https://www.khanacademy.org/math/algebra-basics/core-algebra-linear-equations-inequalities/core-algebra-linear-inequalities/v/one-step-inequalities-2
Homework:
Exercise 11.1 (page 44) # 1 – 3 (a – d) and # 4 (a, b)
Exercise 11.2 (page 48) # 1 – 3
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