trendline: how to set custom formula/function if have both Log and Polynomial

C

cp

thanks for the help in advance

I have a group of data: R & d, want to fit to curve and get the value of constant A and B, as in equation
R=A*[1/(50+d)+1/50]+B*Ln[(50+d)/50], how should I set it so the trendline will be of such form instead of just Log. or just linear

Thanks a lot.
 
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