{ 1*k2*x1 + 1*k2*x2 = k2*k49,
  1*k2*x3 + 1*k2*x4 + 1*k2*x5 = k2*k50,
  1*k2*x6 + 1*k2*x7 + 1*k2*x8 + 1*k2*x12 + 1*k2*x17 + 1*k2*x18 = k2*k51 }