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You bought the book from Kobo, are you using the kepub version downloaded directly to the device or the standard epub version sideloaded? Whichever one you are using you might want to try the other, just to see if it makes a difference.
If not then the first thing I would do is let Kobo know about the problem with the book, and say that you want a refund if they can't fix it. (Or rather, if they can't get the publisher to fix it.)
While you can probably fix the book yourself, it could take a lot of manual editing, many hours of work possibly, to fix things the publisher has done wrong.
I fix fiction books which just have a couple of full-page images which display too small. That takes 5 or 10 minutes usually, but they are usually simple cases where there is just the image on the page, no text, and my goal is just to get the image to display as large as possible. If there are images embedded in the text I expect it would take more work, and probably more knowledge of html/css that I have so far.
Although the equations are too small, do they change in size at all when you adjust the font size? If they stay the same size regardless of font size then they are probably just small bitmap images rather than scalable vector graphics, and it might be difficult to get them to look good at a larger size anyway. If they do change in size then it might be fairly easy to fix just by editing the CSS stylesheet, depending on how the book is layed out.
Sorry for the negativity, I hope someone else will have some suggestions. 70 euro is a lot to pay for a book that doesn't work properly.
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