[R] How to solve this complex equation

[Ssuhanchen]

Hi!

I want to use R to calculate the variable x which is in a complex equation
in below:

 2
 Σ[exp(-x/2)*(x^k)/(2^k*k!)]=0.05
k=0

how to solve this equation to get the exact x in R? 

Thank you very much.




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