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