certain tablature symbols

I have been reading tablature for about 7 months now and I know most of the symbols, but I have come across 2 similar ones I don't recognize and can't find anywhere on the internet. both I can't really show you very well, but i'll try to explain them. one looks kinda like this:
5
7

where the 5 is like a superscript in front of the 7

the other is
x
(7
where the x is also a superscript in front of the 7, except there is a parenthesis-like symbol connecting the x and the 7.

it might be important to note that I saw these symbols in guitar pro and power tab files, not regular text tabs. those programs didn't play the notes any differently that regular notes it seemed, i have just never seen that notation before. what do those notes mean?

The 5 is, well, I don't know the term in English. It's a note played very quickly before the 7, like a 16th or even a 32nd. It can be left out if you wish.

The 5
7 is a grace note. Play the 5th fret then (very) quickly hammer on to the 7th fret.

same thing with the x^7. PLay a muted note then slide (this is what the line means) to 7th fret (slide can be from anywhere on string, generally above when written like this, 2-3 fret slide works best).

EDIT:

ignore me....

Never heard of a crush note...Grace notes is a term I'm familiar with though

my bad its my english getting the better of me there

ignore me.....