You can't install without software and I did post a link for you to go to and download your software. Make sure that is the correct printer X75 they have different models but it sounds like yours is a X75 all in one. The link I posted is from Lexmark site so you should be good to go by just downloading the drivers and software and install. Just click on the operating system you have and the download process should begin.
Yes, the Lexmark X75 is Mac compatible.
don't have any' where do i get the CD
The following can use this type of cartridge: Lexmark Z13, Z23el, Z24, Z25, Z25l, Z331, Z34, Z35, Colour Jetprinter, i32, all in one X72, X74, X75, Lexmark colour Z515, Z600 series, all in one X1100 series, X2200 series, X1200 series.
No. The cartridges for the Dell printer are much larger than the Lexmark printer. The Lexmark equivalent for those Dell cartridges would be the Lexmark 82 and 83 but I am unsure if the electronics for those two are compatible. The Lexmark x75 cartridges are fully compatible with the Dell equivalent, the T0529 and T0530. The only differences in these are which lid gets slapped onto the cartridges. The shape on top will be slightly different making it so that they won't fit in correctly but this can easily be gotten around by simply snapping off the small plastic tab in the printer. Be very certain that you are breaking the correct piece off if you attempt to change the printer as you can break the cartridge holder if you snap off the wrong piece. If you look at the cartridge you will see a raised part on the lid with either a corner missing or a section in the center that is flat, this is where the piece that would prevent a Lexmark cart fitting into a Dell printer would be located. This small plastic piece can be removed with no effect on how the cartridge fits in the printer for printing.
134.62cm x 190.5cm
39 x75 inches
235 x75 x15
39"x80", as opposed to a regular twin, which is 39"x75".