$$(7K^{2}+5K+5K^{3})+(-7K+3K^{3}+k^{2})$$
$8K^{3}+7K^{2}-2K+k^{2}$
$$7K^{2}-2K+5K^{3}+3K^{3}+k^{2}$$
$$7K^{2}-2K+8K^{3}+k^{2}$$
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$24K^{2}+14K-2$
