c_1, x_1, x_2, x_3, x_5, x_6, x_7, 
x_5
6*x_1*x_6+8*x_2*x_6+9*x_1-36*x_3
24*c_1*x_1*x_7+32*c_1*x_2*x_7+9*x_1^2-36*x_1*x_3
6*c_1*x_1+8*c_1*x_2-3*x_1+4*x_2+24*x_3
27*x_1^3+54*x_1^2*x_2-108*x_1^2*x_3+72*x_1*x_2^2+216*x_1*x_3^2+32*x_2^3
