Solve the following equation:

12−30(1.17)k=−2238\displaystyle {12}-{30}{\left({1.17}\right)}^{{k}}=-{2238}

Write your answers exactly (i.e. no decimals and simplified if possible), separated by a comma.
k=\displaystyle {k}=   Hint

Write your answers as decimals rounded to four decimal places.
 

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