maths!
posted by jess .
1/f= 1/u + 1/v
make f the subject of the formulae
thank you in advance!

maths! 
drwls
Create a common denominator for the right side
1/f = (v + u)/uv
Then just invert the fractions. (That is an algebraically allowed operation).
f = uv/(u + v)
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