-(k3*x1 - k7*x4 - k11*x7 - k13*x6 + k6*x1*x3 + k2*x1*x9 + k12*x1*x5)/k1 
-(k4*x2 - k2*x1*x9)/k1 
(k7*x4 - k6*x1*x3)/k1 
-(k7*x4 - k6*x1*x3)/k1 
(k13*x6 - k12*x1*x5)/k1 
-(k13*x6 - k12*x1*x5)/k1 
(k8*x3 + k9*x4 - k10*x7)/k1 
(k14*x5 + k15*x6 - k16*x8)/k1 
(k4*x2 - k5*x9 + k17*x8 - k2*x1*x9)/k1 
x5 - k19 + x6 
x3 - k20 + x4 
