[ Eq(x13, k5 - x3 - x4),
  Eq(x14, k6 - 2*x7 - x6),
  Eq(x23, k33 - k41*x19),
  Eq(x24, k35 - x17 - x20 - x19),
  Eq(x25, k34 - k41*(x17 + x24)),
  Eq(x26, x14/k25/(1 + x14/k25 + x7/k26 + x6/k27 + x14*x2/k30 + x14**2/k31 + x19/k50)),
  Eq(x27, (x7/k26 + x14**2/k31)/(1 + x14/k25 + x7/k26 + x6/k27 + x14*x2/k30 + x14**2/k31 + x19/k50)),
  Eq(x28, x19/k50/(1 + x14/k25 + x7/k26 + x6/k27 + x14*x2/k30 + x14**2/k31 + x19/k50)),
  Eq(x29, x19/k50/(1 + x20/k49 + x19/k50)),
  Eq(x30, x14/k25/(1 + x14/k25 + x7/k26 + x6/k27 + x14*x2/k30 + x14**2/k31)),
  Eq(x31, (x7/k26 + x14**2/k31)/(1 + x14/k25 + x7/k26 + x6/k27 + x14*x2/k30 + x14**2/k31)),
  Eq(x32, x12/k29/(1 + x12/k29)) ]