Designing a Keplerian Telescope with 7X Magnification & 5mm Exit Pupil

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i am to design a keplerian telescope with 7X magnification, 5mm exit pupil, and at least 10mm eye relief.

I have one lens with focal length 35mm, another with focal length 5mm, giving a visual mag of 7X and the exit puiple is 5mm, but how do I account for the 10mm eye relief?
 
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basically, the thing I don't understand is how do I calcuate eye relief for an afocal system?
 

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