The entry to record this event would include a LOSS OF $40,000.
The equipment original cost = $420,000
Accumulated depreciation = $200,000
Selling price = $180,000
Loss = 180,000 - [420,000 - 200,000]
= 180,000 - 220 = - 40,000
Thus, a loss of $40,000 was experienced in the sale of the equipment.