Solve doesn't work, either! (%i7) d; (%o7) [d0, d1, d2] (%i8) eqns; (%o8) [d0 = c0 + b0, d1 = c1 + b1, d2 = c2 + b2, h0 = g0 + f0 - e0, h1 = g1 + f1 - e1, h2 = g2 + f2 - e2, f0 = e0 + b0, f1 = e1 + b1, f2 = e2 + b2, g0 = e0 + c0, g1 = e1 + c1, g2 = e2 + c2] (%i9) solve(eqns,d); (%o9) [] (%i10)