Thanks for all your efforts so far - see below for feedback
#53...I like it --very different/unique - the word Solution may be to subtle though
#54 --- the = can definitely work --maybe better than an arrow as a graphic and the circle works too but the overall impression of it is not right for me --lacks impact but I think you may be on to something
#51
-cool colurs and I like the font - while the graphic is interesting, it does not really work for me
#55 - a bit to basic