Watch the video on solving equations (aome of this is a review from grade 7). We will focus on the algebra rather then the modelling.  Complete the book work at the end of the video and the book work is in a PDF file alone (Attached below). If you want more practice you can try the extra practice sheet, attached as well (But only for extra practice)

Lesson 1 isolate variables https://www.youtube.com/watch?v=XVDwtrGa_PY