For the formula $T = \frac{a\left(1-r^n\right)}{1-r}$ how do you isolate $r$ in terms of $T$, $a$, and/or $n$?
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1Sometimes it's not possible to isolate a variable just using elementary functions. – Michael McGovern Apr 20 '18 at 23:49
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You have to solve equation $a r^n -r T +(T-a)=0$... for r – sirous Apr 21 '18 at 01:10