Answer
$$ = {{x\,\left(5\,x\,x_{2}^4+15\,x_{2}^4+40\,x^2\,x_{2}^3+190\,x\,x_{2} ^3+300\,x_{2}^3+135\,x^3\,x_{2}^2+870\,x^2\,x_{2}^2+2100\,x\,x_{2}^2 +2250\,x_{2}^2+216\,x^4\,x_{2}+1755\,x^3\,x_{2}+5700\,x^2\,x_{2}+ 9250\,x\,x_{2}+7500\,x_{2}+135\,x^5+1323\,x^4+5400\,x^3+11750\,x^2+ 14375\,x+9375\right)}\over{5}} $$
Explanation
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