One line answer :
a,b,x,y = var('a,b,x,y') ; solve([ x + y == a, x - 2*y == b
],x,y,dontsolve='a,b')
First statement is to declare symbolic vars a,b,x,y and second statement is
for solving in symbolics x,y
Dominique
PS : use asksagemath.org
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