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## Homework Statement

Need to rearrange this equation to make b subject

[tex]R = \frac{ab}{a+b}[/tex]

**2. The attempt at a solution**

R(a+b) = ab

Ra +Rb = ab

[tex]\frac{Rb}{b} = a [/tex] x -Ra

i think i did the last step wrong. Where do i go to now?

Thanks