{ 1*k1*x1 + 1*k1*x2 = k1*k49,
  1*k1*x3 + 1*k1*x4 + 1*k1*x5 = k1*k50,
  1*k1*x6 + 1*k1*x7 + 1*k1*x8 + 1*k1*x12 + 1*k1*x17 + 1*k1*x18 = k1*k51 }