I don't want to sound like a jerk, but you really should have researched this before you bought a kindle (or e-reader).
6" screens and PDFs just don't work well. PDFs were meant to replicate the printed page exactly, while 6" e-readers are meant for re-flowable text that can vary upon whatever the reader wants.
That's why they make the bigger DX model, though that's far from perfect...
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