Solve. Separate multiple solutions with commas. Be sure to reduce all solutions completely.
k415=−21k3−9090−k2−66\displaystyle \frac{{k}^{{4}}}{{15}}=\frac{{-{21}{k}^{{3}}-{90}}}{{90}}-\frac{{{k}^{{2}}-{6}}}{{6}}15k4=90−21k3−90−6k2−6
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