$$2.1x^{3}+8.2x^{2}+5-8x+1.9x^{9}-1.2x^{2}+7x+-1$$
$\frac{19x^{9}}{10}+\frac{21x^{3}}{10}+7x^{2}-x+4$
$$2.1x^{3}+7x^{2}+5-8x+1.9x^{9}+7x-1$$
$$2.1x^{3}+7x^{2}+5-x+1.9x^{9}-1$$
$$2.1x^{3}+7x^{2}+4-x+1.9x^{9}$$
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$\frac{19x^{9}+21x^{3}+70x^{2}-10x+40}{10}$
