Alister Doyle, I work at Noodle.
Have you seen some of these other great videos on solving inequalities?

https://www.noodle.com/learn/details/19952/absolutevalueinequalities

https://www.noodle.com/learn/details/327265/absolutevalueinequalities1

https://www.noodle.com/learn/details/152365/algebraabsolutevalueinequalities