If for some reason your Android powered smartphone does not perform as good as it used to, or you want to sell it I suggest you to bring it to its original factory state.
RawTherapee is a free open source application for opening and editing RAW image files. It works on all major operating systems such as Windows, Linux and Mac OS X.
By default Windows calculator doesn't support order of operation, to enable the functionality you need to activate the scientific view, let me show you how.