This algebra video tutorial explains how to add and subtract rational expressions with unlike denominators. It explains how to get the common denominator in order to combine the numerators of the fractions. This video contains plenty of examples and practice problems on simplifying rational expressions.
Algebra - Free Formula Sheets:
https://www.video-tutor.net/formula-sheets.html
Rational Functions - More Lessons:
https://www.video-tutor.net/rational-functions.html
Final Exam and Test Prep Videos:
https://bit.ly/41WNmI9