[ Eq(Derivative(x1, t), ((-1)*k1*k12*x1*k35 + 1*k1*k22*x3)/k1),
  Eq(Derivative(x2, t), (1*k1*k12*x1*k35 + (-1)*k1*k19*x2)/k1),
  Eq(Derivative(x3, t), (1*k1*k19*x2 + (-1)*k1*k22*x3)/k1),
  Eq(Derivative(x4, t), 0),
  Eq(Derivative(x5, t), 0),
  Eq(Derivative(x6, t), (1*k2*k14*x10 + (-1)*k2*k21*x6)/k2),
  Eq(Derivative(x7, t), (1*k2*k18*x12 + (-1)*k2*k29*x7*x26)/k2),
  Eq(Derivative(x8, t), (1*k2*k11*x9*k36 + (-1)*k2*k24*x8*x16)/k2),
  Eq(Derivative(x9, t), ((-1)*k2*k11*x9*k36 + 1*k2*k24*x8*x16)/k2),
  Eq(Derivative(x10, t), (1*k2*k6*x14*x13 + 1*k2*k13*x11*x13 + (-1)*k2*k14*x10)/k2),
  Eq(Derivative(x11, t), (1*k7*x14*x2 + (-1)*k2*k13*x11*x13 + (-1)*k2*k15*x11)/k2),
  Eq(Derivative(x12, t), ((-1)*k2*k18*x12 + 1*k2*k29*x7*x26)/k2),
  Eq(Derivative(x13, t), (1*k2*k4*x22*x8 + (-1)*k2*k5*x13)/k2),
  Eq(Derivative(x14, t), ((-1)*k2*k6*x14*x13 + (-1)*k7*x14*x2 + 1*k2*k15*x11 + 1*k2*k21*x6)/k2),
  Eq(Derivative(x15, t), (1*k2*k8*x20*x11 + (-1)*k2*k9*x15*x12 + 1*k2*k16*x21 + (-1)*k2*k17*x15 + (-1)*k2*k30*x15*x25)/k2),
  Eq(Derivative(x16, t), (1*k2*k3*x23 + (-1)*k2*k10*x16*x15 + (-1)*k2*k20*x16*x21)/k2),
  Eq(Derivative(x17, t), ((-1)*k2*k23*x17*x21 + (-1)*k2*k25*x17*x15 + 1*k2*k26*x19 + 1*k2*k27*x18 + (-1)*k2*k28*x17*x8)/k2),
  Eq(Derivative(x18, t), ((-1)*k2*k27*x18 + 1*k2*k28*x17*x8)/k2),
  Eq(Derivative(x19, t), (1*k2*k23*x17*x21 + 1*k2*k25*x17*x15 + (-1)*k2*k26*x19)/k2),
  Eq(Derivative(x20, t), ((-1)*k2*k8*x20*x11 + 1*k2*k17*x15)/k2),
  Eq(Derivative(x21, t), (1*k2*k9*x15*x12 + (-1)*k2*k16*x21 + 1*k2*k30*x15*x25)/k2),
  Eq(Derivative(x22, t), ((-1)*k2*k4*x22*x8 + 1*k2*k5*x13)/k2),
  Eq(Derivative(x23, t), ((-1)*k2*k3*x23 + 1*k2*k10*x16*x15 + 1*k2*k20*x16*x21)/k2),
  Eq(Derivative(x24, t), (1*k2*k31*x25 + (-1)*k32*x24*x2)/k2),
  Eq(Derivative(x25, t), ((-1)*k2*k31*x25 + 1*k32*x24*x2)/k2),
  Eq(Derivative(x26, t), (1*k33*x27*x2 + (-1)*k2*k34*x26)/k2),
  Eq(Derivative(x27, t), ((-1)*k33*x27*x2 + 1*k2*k34*x26)/k2),
  Eq(Derivative(x28, t), 0) ]