Comment #1 on issue 2014 by jensen.oyvind: sympy.solvers.solvers.solve should also allow frozenset to hold equations
http://code.google.com/p/sympy/issues/detail?id=2014
sympy.core.Tuple would also be very useful. Then one could do
eqs = Tuple(x + y, x - 3) eqs.subs(x, z)
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