Videos for Lesson 1.4.
Solving inequalities.
http://www.phschool.com/atschool/academy123/english/academy123_content/wl-book-demo/ph-487s.html
Inequalities with no solutions or All solutions.
http://www.phschool.com/atschool/academy123/english/academy123_content/wl-book-demo/ph-488s.html
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