math

5 divided by (3-e to the -x power)=4

5/(3- e^-x) = 4
5 = 12 - 4 e^-x
4 e^-x = 7
e^-x = 7/4
e^x = 4/7
Take natural logs of both sides,
x = ln (4/7) = -0.5596

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