Algebra w/ Daniel

This term I have been in Daniel's math workshop. One of the follow ups are challenging like a sheet to work on with a bunch of different questions. The equations started of simple for example: 2 (x + 4) =17. As I progressed it became slightly more complicated and  the sums were now like: 5x + 3 ( 4 - x )  =17. I think this maths workshop is a good level for me but I still need to learn some more rules.