Solve: when we request symbols or none symbols in a system with inf sols only some are passed

[latot]

Hi, well when we request symbols but the system have multiples solutions we only get one of it, the focus here its the solutions are incomplete:

>>> solve([Eq(20*x,20*y)], x, y)
{x: y}

this should be:

>>> solve([Eq(20*x,20*y)], x, y)
{x: y, y: y}

equal to:

>>> solve([Eq(20*x,20*y)])
{x: y, y: y}

This is very important to don't confuse with #11656

Thx. Cya.

[oscarbenjamin]

Now both examples return the other result:

In [5]: solve([Eq(20*x,20*y)], x, y)
Out[5]: {x: y}

In [6]: solve([Eq(20*x,20*y)])
Out[6]: {x: y}