a=3+cb+2\displaystyle a = \frac{3 + c}{b + 2}a=b+23+c
Make b b\,b the subject of the formula.
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Markscheme
Changing the Subject of a Formula Questions
210 exam-style questions on OCR GCSE Maths Changing the Subject of a Formula. Each one has a worked solution and a mark scheme showing where the marks go.