I have the following situation: -main Mac partition on Container disk 118 GB -Data partition total 369 GB (DADRA_2) -empty partition created when I was trying to resize things 20GB (untitled)

I want to move the 20GB to my main partition because right now I don't have enough space to install Mojave. (I have high sierra). I can't figure out how to do even when I boot into Recovery Mode and use Disk Utility. How do I add the 20GB space to my main partition? (Disk Utility screenshot attached)

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