x_1, x_2, x_3, 
7*x_2^4-20*x_1^2
2160*x_1^2*x_3^4+1512*x_1*x_3^4+315*x_3^4-4000*x_1^2-2800*x_1-490
40320000*x_1^6*x_2^2*x_3+67200000*x_1^5*x_2^3+28800000*x_1^5*x_2^2*x_3+94080000*x_1^4*x_2^3-23520000*x_1^4*x_2*x_3^2-10080000*x_1^4*x_3^3+40924800*x_1^3*x_2^3+21168000*x_1^3*x_2^2*x_3-41395200*x_1^3*x_2*x_3^2-28224000*x_1^3*x_3^3+2634240*x_1^2*x_2^3+4939200*x_1^2*x_2^2*x_3-26726560*x_1^2*x_2*x_3^2-15288000*x_1^2*x_3^3-2300844*x_1*x_2^3+347508*x_1*x_2^2*x_3-7727104*x_1*x_2*x_3^2-1978032*x_1*x_3^3-432180*x_2^3-852355*x_2*x_3^2-180075*x_3^3
