[ Eq(x26, k60*x11 + k60*x13),
  Eq(x27, k61*x12 + k61*x13),
  Eq(x28, k65*x15),
  Eq(x29, k64*x18 + k64*x19),
  Eq(x30, k63*x17 + k63*x19),
  Eq(x31, k66*x25),
  Eq(x32, k68*x21 + k68*x23),
  Eq(x33, k67*x22 + k67*x23),
  Eq(x34, k62*x5) ]