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I found a better workaround, see next para. But I am puzzled by the amount ofnwork that someone-the publisher? - has devoted to creating a huge set of not very compatible images, brus stroke by brush stroke.
The workaround. Checking Amazon Kindle store ,they offer the book cheaply. I grabbed the free sample into kindle for android on my same tablet. The kindle version has equations what scale up and down when you change text size, and are blacker and at the same size as the text.
And presumably, if I bought it and converted to epub I would have something that works on all my devices.
Will look at the kindle sample book code later.
Or
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