I have my disk partitioned the following way:
I want to get rid of sda5 by merging it either with sda1 or sda6. I can't do that right now, can I? Because it's not placed next to either sda1 or 6. So how can I do that?
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You can megre sda5 with sda6:
This way you keep the WinRecovery partition, in case you need it.
But if you want a 15GB partition for future test or permanent installs you could skip steps 3,4,5. At the time of the GPartEd-screenshot seems plenty of free space in sda6.