I'd like a equation to be turned 270 degrees clock-wise next to normal text.
So there are two examples in the file. The first example shows how it looks correctly in total, but the equation should be turned exactly the other way. So that's why I made the second example. Originally, I only made the second example but noticed how the text and equation don't match up vertically.
What I want to achieve is: The second example is aligned vertically in a proper way and all the errors are gone. I got 14 errors when compiling the MWE, 7 for each 2 minipages obviously.
Please help.

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