>
> √20-19r
>r = ------
> 6
>
> 20-19r
>r^2 = ------
> 6
>
>
For clarity you should avoid using the √ symbol, looking at the formula, I thought it was
r = sqrt(20-19r)/6 and not r = sqrt((20-19r)/6) as it appears from your solution
"The five senses obstruct or deform the apprehension of reality."
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"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
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