Prime in equation

[jdeland1 at comcast.net]

I am struggling with the equation editor, trying to add a prime symbol. I need the equation to read 

Ef '(2Nf) 

but I am getting this: 

Ef' (2Nf) 

How do I apply the ' to the expression inside the ( )? The Help is no help. 


Jack DeLand 

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