{ diff(x1, t) = ((-1)*k3*k5/2*(k22 + x9 + k6 - sqrt((k22 + x9 + k6)^2 - 4*k22*x9)) + 1*k3*k13*x4*x6/(k14*k15 + k15*x6 + x4*x6 + k16*x5))/k3,
  diff(x2, t) = (2*k3*k5/2*(k22 + x9 + k6 - sqrt((k22 + x9 + k6)^2 - 4*k22*x9)) + (-1)*k3*k7*(x2*x6 - x7*x3*x5/k8)/(k9 + x2*x6*k9/k10 + x7*x3*x5/k8))/k3,
  diff(x3, t) = (1*k3*k7*(x2*x6 - x7*x3*x5/k8)/(k9 + x2*x6*k9/k10 + x7*x3*x5/k8) + (-5)*k3*k11*x3/(x3 + k12) + (-1)*k19*(x3*k24 - k23*x5)/((x3 + k23)*k17 + (k24 + x5)*k18 + k18*k17*(x3/k18 + x5/k17)*(k24/k17 + k23/k18)))/k3,
  diff(x4, t) = (3*k3*k11*x3/(x3 + k12) + (-1)*k3*k13*x4*x6/(k14*k15 + k15*x6 + x4*x6 + k16*x5))/k3,
  diff(x5, t) = (1*k3*k7*(x2*x6 - x7*x3*x5/k8)/(k9 + x2*x6*k9/k10 + x7*x3*x5/k8) + 2*k3*k11*x3/(x3 + k12) + 1*k19*(x3*k24 - k23*x5)/((x3 + k23)*k17 + (k24 + x5)*k18 + k18*k17*(x3/k18 + x5/k17)*(k24/k17 + k23/k18)) + (-1)*k3*k1*x7*x5/((x7 + k20)*(x5 + k21)))/k3,
  diff(x6, t) = ((-1)*k3*k7*(x2*x6 - x7*x3*x5/k8)/(k9 + x2*x6*k9/k10 + x7*x3*x5/k8) + (-1)*k3*k13*x4*x6/(k14*k15 + k15*x6 + x4*x6 + k16*x5) + 1*k3*k1*x7*x5/((x7 + k20)*(x5 + k21)))/k3,
  diff(x7, t) = (1*k3*k7*(x2*x6 - x7*x3*x5/k8)/(k9 + x2*x6*k9/k10 + x7*x3*x5/k8) + 1*k3*k13*x4*x6/(k14*k15 + k15*x6 + x4*x6 + k16*x5) + (-1)*k3*k1*x7*x5/((x7 + k20)*(x5 + k21)))/k3,
  diff(x8, t) = 0,
  diff(x10, t) = 0,
  diff(x11, t) = 0 }