Do I get my equipment back if it is equipped to another unit? This equipment was originally taken from Akshan. I have killed Akshan but their equipment is attached to another unit.

Yes, you regain control of the equipment, but it remains attached to the other unit.

According to RiftJudge FAQ #9043 and FAQ #9395, here is how this interaction works:

1. Akshan Leaves the Board: When the Akshan that stole your equipment leaves the board, the control-change effect ends. Control of the equipment immediately reverts to you (the original owner).
2. Attachment Remains: The equipment does not automatically detach or return to your hand. Because it is attached to a unit that is still on the board, it remains attached to that unit.
3. Taking it Back: Now that you control the equipment again, you can use your own effects (such as the Weaponmaster keyword or other abilities that move equipment) to move it from that unit to one of your own units.

Important Note: While you regain control of the equipment, you cannot use the equipment's own "Equip" ability while it is attached to a unit, because attached gear has inactive rules text (Rule 718.2). You must use an external effect to move it.