[ 1*k[39]*x[1] + 1*k[39]*x[2] = k[39]*k[40],
  1*k[39]*x[3] + 1*k[39]*x[4] + 1*k[39]*x[5] = k[39]*k[41],
  1*k[39]*x[6] + 1*k[39]*x[7] = k[39]*k[42],
  1*k[39]*x[8] + 1*k[39]*x[9] + 1*k[39]*x[13] = k[39]*k[43],
  1*k[39]*x[10] + 1*k[39]*x[11] + 1*k[39]*x[14] = k[39]*k[44] ]