Get another SDCard and a USB reader. Build a copy of plain Raspbian on the new SDCard, boot that. Put your card with the partitioning problems in the USB reader, plug the USB reader into your RPi.
sudo apt-get install gparted
You can then use sudo gparted to resize/move the partitions on your card (get it down to 3.9GB). Then take a new image of that smaller card.
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