The problem
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I do not understand the last line here.
Answer provided by our tutors
You have typed "R_x" into the equation. This is creating issues as the solver is recognizing 'x' as variable and not as index.
If you type "R" instead of "R_x" you will get the following solution:
R = 499000/501
R = 996 4/501
R = 996.007 approximately