Just disabling your apps won't free much internal memory as deleting apks will.
The internal memory and the /system are two separate partitions. You cannot access the free space on /system unless you are rooted (and you have limited use of it even if you are rooted, for example you can move apps there with titanium backup, but cannot use it for storing media files).
In addition the obvious proficiency with graphics, creating agood Android theme … more
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