x_1, x_2, x_3, x_4, x_5, 
x_4*(2*x_1-3)
-x_4
4*x_4
-2*x_1*x_4
2*x_1*x_4-x_2-2*x_4
2*x_1*x_2+4*x_1*x_4-2*x_1*x_5-x_2
-x_1^2*x_3-x_1*x_3-2*x_1*x_5+x_2+2*x_3
x_1^2*x_4-2*x_1*x_2-x_1*x_4+2*x_1*x_5+2*x_2+6*x_4
x_1^2*x_5-2*x_1*x_2-2*x_1*x_3-x_1*x_5+2*x_3-3*x_4
-x_1^2*x_2-x_1*x_2+2*x_1*x_3-2*x_1*x_4+4*x_1*x_5-2*x_3
