https://docs.google.com/presentation/d/1VXZqeq8wlNmG8Mhn9qA1vAYjn2pih0aKs9c1iHGT-io/edit?usp=sharing
https://drive.google.com/file/d/1k6WSh0ArAwnqqZT7A5NOlzogS7amoI1y/view?usp=sharing
https://www.lavc.edu/math/library/math113_114_115/Worksheets/lineqnsfractions.pdf
https://www.chipola.edu/instruct/math/ClassMaterials/MAT%200024%20094/Chapter%202%20094/Sect%202.2b%20094.pdf