I'm adding journal entries to an Unadjusted Trail Balance. When I have an Accumulated depreciation -equipment in the amount of $16,861. Do I add the Accumulated depreciation equipment amount $14,929, from my journal?

Journal Entry Debit (a) Depreciation expense - Equipment Accumulated depreciation -Equipment Credit $14,929 $14,929 (b) Depreciation expense - Professional library Accumulated depreciation - Professional library $7,464 $7,464V (c) Customer Account Sales Revenue Service Recievable $7,500 $7,500