On Tue, 13 Jul 2010, Mein Linuxrechner Arbeit wrote:
> To say it in brief: solving linear equations, getting rid of
> variables, solve to get a variable in an expression, this is what I
> am interested in, but it is always necessary to use the results in
> follwing-up calculations.
Sounds like a job for subst(), e.g.
firsteqn : 2*x+3*y = 7 ;
solnfory : solve(firsteqn,y) ;
secondeqn : 8*x-3*y = 2 ;
secondeqnwithyeliminated : subst(solnfory,secondeqn) ;
solnforx : solve(secondeqnwithyeliminated,x) ;
--
HTH,
Dan