[ Eq(1*k1*x1 + 1*k1*x2 + 1*k1*x3 + 1*k1*x5, k1*k26),
  Eq(1*k1*x4 + 1*k1*x5 + 1*k1*x6 + 1*k1*x8, k1*k27),
  Eq(1*k1*x7 + 1*k1*x8 + 1*k1*x9 + 1*k1*x11, k1*k28),
  Eq(1*k1*x10 + 1*k1*x11 + 1*k1*x12 + 1*k1*x13, k1*k29) ]