unsupported operand type(s) for -: 'list' and 'Integer'

[aktech]

Reproduce here: https://sympygamma.com/input/?i=solve+x**2+-+4

Error:

Error:
solve x**2 - 4
unsupported operand type(s) for -: 'list' and 'Integer'

[aktech]

This is likely due to incorrect parsing, I believe the expression is parsed as:

solve(x**2) - 4

Which results in solve(x**2) returning a list, hence the error: (unsupported operand type(s) for -: 'list' and 'Integer')

[aktech]

This could also be the desired behaviour, but either ways it doesn't looks great.

[rohit11544]

solve(x**2 -4) this fixes #168