x_1, x_2, x_3, x_4, x_5, x_6, 
2000000000000000000000000*x_1*x_2-9
10000*x_3*x_4-83333*x_2
100000000000000*x_4*x_5-17543859*x_3
100000000000000*x_4*x_6-1
x_1-x_2-x_3-x_5
2*x_1+x_6-2*x_2-x_3-x_4
