Your disk appears to be partitioned using GPT and boots using EFI, so logical/extended partitions do not apply to you. The only thing you need to do is boot from the livecd or usb, and move sda4 to the left, then move sda5 to the left, then grow sda5 to the right. This should be quite easy using gparted from a livecd/usb. The risk is in moving those two partitions to the left. A power failure or crash while moving those partitions will destroy the data in them. Hence, have a backup.
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