k3*x2 + k8*x5 - k2*k22*x1 - k9*x1*x6 
k2*k22*x1 - k4*x2 - k3*x2 + k5*k23*x3 
k4*x2 + k7*x5 - k5*k23*x3 - k6*x3*x4 
k7*x5 + k12*x8 - k6*x3*x4 - k13*x4*x9 
k6*x3*x4 - k8*x5 - k7*x5 + k9*x1*x6 
k8*x5 + k11*x8 - k9*x1*x6 - k10*x6*x7 
k11*x8 + k16*x11 - k10*x6*x7 - k17*x7*x12 
k10*x6*x7 - k12*x8 - k11*x8 + k13*x4*x9 
k12*x8 + k15*x11 - k13*x4*x9 - k14*x9*x10 
k15*x11 + k20*x13 - k21*k24*x10 - k14*x9*x10 
k14*x9*x10 - k16*x11 - k15*x11 + k17*x7*x12 
k16*x11 + k19*x13 - k18*k25*x12 - k17*x7*x12 
k18*k25*x12 - k20*x13 - k19*x13 + k21*k24*x10 
x10 - k26 + x11 + x12 + x13 
x7 - k27 + x8 + x9 + x11 
x4 - k28 + x5 + x6 + x8 
x1 - k29 + x2 + x3 + x5 
