On 2015-02-27, j wade <wade.jer...@gmail.com> wrote:

> If I just enter
>
> solve(900000*e^(-1)/c == 1.50000000000000, c)
>
> I again get [].
>
> But, if I enter
>
> b=var('b')
> solve(900000*e^(-1)/b == 1.50000000000000, b)
>
> I get the solution:
>
> [b == 600000*e^(-1)]

For the record, when I try this directly in Maxima, the equation is
solved in both cases. (I assume that Sage calls Maxima to solve
equations; is that right?) Heaven knows Maxima has > 1 bug in which
results depend on the names of variables, but I guess this isn't
one of them.

best,

Robert Dodier

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