[ Eq(1*k1*x1 + 1*k1*x2, k1*k49),
  Eq(1*k1*x3 + 1*k1*x4 + 1*k1*x5, k1*k50),
  Eq(1*k1*x6 + 1*k1*x7 + 1*k1*x8 + 1*k1*x12 + 1*k1*x17 + 1*k1*x18, k1*k51) ]