I FOUND OUT HOW TO DO IT (yes i know its a old topic but i still have a solution)
download all hexxit stuff with technic launcher
go to appdata .technic hexxit and copy all in it to .minecraft (make sure ur mod and coremod folders are empty first)
open your minecraft.jar and ur modpack.jar with winrar
drag all files from modpack.jar into minecraft.jar and use 'add and replace' setting
then delete the meta-inf folder in minecraft.jar (if it says error proces is being used then open taskmanager and stop the java proces)
select the minecraft.jar file in magic launcher (it will say modified)
then run it WITH THE LOG
the log will appear and ur minecraft will launch
your screen will freeze but you can still move your mouse (not click anything)
after a minute it will unfreeze with minecraft running with 68 mods
if you still want it then ENJOY