Question: solving for infinity

Hey guys,

I have a quick question about solving for variables = infinity.  When I code in

solve(infinity=x,x);

the output returns as blank.  Does anyone know why this is?  When I do

the output returns x=infinity and y=infinity.  But when I do

solve({y=0,x=infinity});

then there is no output.  Does anyone know how to get output to appear for the cases that I mentioned?

Thanks

solve({y=infinity,x=infinity});

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