[ Eq(1*k1*x1 + 1*k1*x2, k1*k32),
  Eq(1*k1*x3 + 1*k1*x4 + 1*k1*x5, k1*k33),
  Eq(1*k1*x6 + 1*k1*x7 + 1*k1*x8, k1*k34),
  Eq(1*k1*x12 + 1*k1*x13, k1*k35) ]