Unable to merge two partitions

I have my Macintosh HD partition, and a bunch of GB of free space, also partitioned. I am unable to merge the two together, there seems to be no drop down arrows to have them combine. Also, I cannot reformat the free space, so all I am left with is 350GB of free space and 350 GB of Macintosh HD. Does anyone know how I could possible merge the two together again?

If the Macintosh HD partition is above the free space, drag the slider between them as far down as it will go and click Apply.
If the Macintosh HD partition is below the free space, create a new partition in the free space, clone the contents of Macintosh HD to it, restart from the newly-created partition, delete Macintosh HD, and then proceed as above.
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