IGCSE Maths / Advanced algebra
When the subject appears twice revision notes
Edexcel International GCSE Maths (4MA1), chapter 23: Advanced algebra, specification point 2.3a. Part of the full course.
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When the letter you want to make the subject appears more than once, first clear the fraction, then gather the letter terms and factorise. This puts the letter in one place so you can divide by the whole bracket.