Difference in total count last month

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Hi there,

I'm not quite getting the result I was hoping for. I have a list of licenses for a customer where we want to see the changes in Power BI. Here's the data we currently made up with queries:

As we can see, there are some differences, but I like to have these differences as a measure so I can slice my graphs based on the selected month. I already managed to get the measure for 'New Licenses' but not for the removed ones.

Any help?