[ Eq(1*k1*x1 + 1*k1*x2 + 1*k1*x3 + 1*k1*x4 + 1*k1*x6 + 1*k1*x7, k1*k49),
  Eq(1*k1*x1 + 1*k1*x4 + 1*k1*x5 + 1*k1*x11, k1*k50),
  Eq(1*k1*x8 + 1*k1*x9, k1*k51),
  Eq(1*k1*x10 + 1*k1*x11, k1*k52) ]