Question

1/x = 1/y + 1/z then 'x' in terms of 'y' and 'z' is given by?

Answer 1

$\frac{1}{x} = \frac{1}{y} + \frac{1}{z} \\ \frac{1}{x} = \frac{z + y}{yz} \\ x = \frac{yz}{z+ y}$

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Answer 2

1/x=1/y +1/z =(y+z)/yz. Invert both sides x=yz/(y+z)