The equation simply says that 1/R = 1/R1 + 1/R2 and to continue adding them up for as many resistors (n means number of resistors) as you have in parallel, that's all that ....+ stuff in the mathematical series means. Do you have a calculator that inverts?
My guess is that the shunt and the two resistors across it are to be used in calibration and can be clipped out if necessary by the calibrator if the calibration pot does not have adequate range.
Why do you think the meter reads low, have you measured a known voltage standard?
jr
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