How to record the sale of a fixed asset at year end?

First you need to get your depreciation up-to-date on the asset. Calculate your depreciation for the period.

Debit Depreciation Expense for the amount
Credit Accumulated Depreciation

Debit Cash for the amount received
Debit Accumulated Depreciation for the amount in the account
Credit Equipment for the cost of the equipment

Debit or Credit the difference (if any) as a gain or loss

Yo have to remove the asset and the associated Accumulated Depreciation accounts

The differences between these accounts and the cash received is a gain or loss.

Yes but How do I record the gain or loss. As other income or other expenses?

A gain or loss will be recorded in the Income Statement as Other Gains and revenues or the other losses and expenses section of the Income Statement.