{ x23 = (x10 + x21)/(x10 + x9 + x8 + x17 + x18 + x21 + x22),
  x24 = (x7 + x17 + x18 + x19)/(x7 + x6 + x5 + x17 + x18 + x15 + x16 + x19 + x20),
  x25 = (x4 + x15 + x16)/(x3 + x4 + x15 + x16),
  x26 = x23/k1,
  1*k2*x1 + 1*k2*x13 = k2*k33,
  1*k2*x2 + 1*k2*x14 = k2*k34,
  1*k2*x3 + 1*k2*x4 + 1*k2*x13 + 1*k2*x14 + 1*k2*x15 + 1*k2*x16 = k2*k35,
  1*k2*x5 + 1*k2*x6 + 1*k2*x7 + 1*k2*x15 + 1*k2*x16 + 1*k2*x17 + 1*k2*x18 + 1*k2*x19 + 1*k2*x20 = k2*k36,
  1*k2*x8 + 1*k2*x9 + 1*k2*x10 + 1*k2*x17 + 1*k2*x18 + 1*k2*x21 + 1*k2*x22 = k2*k37,
  1*k2*x11 + 1*k2*x21 + 1*k2*x22 = k2*k38,
  1*k2*x12 + 1*k2*x19 + 1*k2*x20 = k2*k39 }