I can't find the page you asked for. You might have made a mistake when typing, or perhaps the page you wanted isn't there any more. Ask your teacher for help if you don't know what to do.
The page I couldn't find was: /wp-content/uploads/2021/02/Year-6-Maths-Wednesday-3rd-February-LO_-To-find-a-one-step-rule-algebra.pdf