Cannot delete or merge old boot camp partition in El Capitan So i've battled with this for quite some time, look up various topics with various solutions, however i have yet to succeed with merging my partitions into one. I had previously installed windows 10 on it, but after i partitioned for a mutual accessible drive (for dropbox), windows stalled and i had to reformat it, resulting in a sort of "locked" partition.

If i click on "Partition" in Disk Utility, there are two major partitions, where neither of them have the "-" option available(greyed out). I have tried to partition DeleteThis into both ExFat, Fat and Journaled OS X, with no difference.

diskutil list reveals this:


and gpt -r show -l /dev/disk0 shows this:


I've also tried to reboot into recovery mode and use the Disk Utility there, with no different result than from normal. 

EDIT: I have of course also tried using Boot Camp Assistant, but it just says "The start disk cannot be partitioned or restored as a single partition".
The answer is so simple. Forget terminals and internet recovery. Here's what you gotta do:


Format the BOOTCAMP-partition through disk utility to MS-DOS (FAT)
Press cmd + space and write bootcamp-assistant, open bootcamp
Erase windows and merge the partitions as one mac HD-partition.