{ x25 = x1/(1 + x7/k6 + x9/k10),
  x26 = k9/(k10*k29)*x9*x25,
  x27 = x6*x43*k30/(k31 + x6),
  x28 = x14*x43*k32/((k33 + x14)*(1 + x31/(x43*k16)*(1 + x42/k34))),
  x29 = x8*x34/(k35*(1 + x42/k36 + x8/k35) + x34),
  x30 = x8 - x29,
  x31 = x9*x43*k37/(k38*(1 + x9/k38 + x11/k39)),
  x32 = x10/(1 + (x12 + x13)/k22),
  x33 = x11*x43*k37/(k39*(1 + x9/k38 + x11/k39)),
  x34 = x16*x43*k40/(k41 + x16),
  x35 = x34 - x29 }