Have no idea how to type this in properly :(..
This is the corresponding input.
You cannot facing the extreme intelligence of WA because non-atomic symbol names seem to become interpreted as a product
which is the conventional meaning, indeed. Just use poor man's solution calling your
$xy$ variable simply
P.S.: The habit to interpret
$x^2$ can be justified by e.g. Newton's handwriting, starting with the third power an exponent was used, the second power was written by repetition of the symbol ...
Didn't work... the program thinks this is what I tried to input...
Sorry if I'm misreading the expression, but isn't that equivalent to what you wanted to input?
You could try like this
((x^2 + x)/7) (28/(x y + y))