So i know that |-5| =5 but what does this -|-5| equal? and explain why

Absolute value
means whatever is inside is positive, once we resolve the inside, work out

|-5|=5

now -5=?=-5

answer is -5 since - of + is negaitve
if you don't get it still think like this

|-5|=5
mulitp;ly by -1 everybody
-|-5|=-5