{ 1*k39*x1 + 1*k39*x2 = k39*k40,
  1*k39*x3 + 1*k39*x4 + 1*k39*x5 = k39*k41,
  1*k39*x6 + 1*k39*x7 = k39*k42,
  1*k39*x8 + 1*k39*x9 + 1*k39*x13 = k39*k43,
  1*k39*x10 + 1*k39*x11 + 1*k39*x14 = k39*k44 }