{ diff(x1, t) = ((-1)*k38*k1*x1*x27 + 1*k38*k3*x3)/k38,
  diff(x2, t) = (1*k38*k1*x1*x27 + (-1)*k38*k2*x2)/k38,
  diff(x3, t) = (1*k38*k2*x2 + (-1)*k38*k3*x3)/k38,
  diff(x4, t) = ((-1)*k38*k4*x4*x2 + 1*k38*k6*x6)/k38,
  diff(x5, t) = (1*k38*k4*x4*x2 + (-1)*k38*k5*x5*x18)/k38,
  diff(x6, t) = (1*k38*k5*x5*x18 + (-1)*k38*k6*x6)/k38,
  diff(x7, t) = ((-1)*k38*k7*x7*x5 + 1*k38*k8*x8)/k38,
  diff(x8, t) = (1*k38*k7*x7*x5 + (-1)*k38*k8*x8)/k38,
  diff(x9, t) = (1*k38*k9*x10 + (-1)*k38*k12*x9*x5)/k38,
  diff(x10, t) = ((-1)*k38*k9*x10 + 1*k38*k12*x9*x5)/k38,
  diff(x11, t) = (1*k38*k10*x12 + (-1)*k38*k11*x11*x16*x5)/k38,
  diff(x12, t) = ((-1)*k38*k10*x12 + 1*k38*k11*x11*x16*x5)/k38,
  diff(x13, t) = (1*k38*k13*x14*x24 + (-1)*k38*k14*x13*x28)/k38,
  diff(x14, t) = ((-1)*k38*k13*x14*x24 + 1*k38*k14*x13*x28)/k38,
  diff(x15, t) = (1*k38*k15*x16 + (-1)*k38*k16*x15*x26)/k38,
  diff(x16, t) = ((-1)*k38*k15*x16 + 1*k38*k16*x15*x26)/k38,
  diff(x17, t) = (1*k38*k17*x18 + (-1)*k38*k18*x17*x14)/k38,
  diff(x18, t) = ((-1)*k38*k17*x18 + 1*k38*k18*x17*x14)/k38,
  diff(x19, t) = (1*k38*k20*x20 + (-1)*k38*k22*x19*x10)/k38,
  diff(x20, t) = ((-1)*k38*k20*x20 + 1*k38*k22*x19*x10)/k38,
  diff(x21, t) = (1*k38*k19*x22 + (-1)*k38*k21*x21*x14)/k38,
  diff(x22, t) = ((-1)*k38*k19*x22 + 1*k38*k21*x21*x14)/k38,
  diff(x23, t) = ((-1)*k38*k23*x23*x8 + 1*k38*k24*x24*x10)/k38,
  diff(x24, t) = (1*k38*k23*x23*x8 + (-1)*k38*k24*x24*x10)/k38,
  diff(x25, t) = (1*k38*k25*x26 + (-1)*k38*k26*x25*x2)/k38,
  diff(x26, t) = ((-1)*k38*k25*x26 + 1*k38*k26*x25*x2)/k38 }