Here are some files for Year 9 Equations work

First explore the algebra balances here Algebra Balance Scales or with negative numbers here Algebra Balance Scales – Negatives

Then have a go at the soccer game 

http://www.math-play.com/soccer-math-one-step-equations-game/one-step-equations-game.html

Then finally download this spreadsheet https://www.dropbox.com/s/nwjvggwypllav6b/Equations%20Step%20by%20Step%20sheet.xlsx 

and complete it (It gives you ticks when you get the steps correct)