What are the accounting equations for:

Transaction #1 Sunshine Publishers issues 100 shares of common stock for $4000 cash.

Transaction #2: Sunshine publishers receives $2000 cash advance payment for books yet to be shipped & delivered (shipping is expected in five weeks).

Transaction #3: Sunshine publishers purchases $6000 of paper and ink to be used in their book manufacturing process. The purchase is made on account.

Transaction #4: Sunshine publishers ships & delivers the books that were ordered for $2000 in transaction #2, completing their obligation to the customer. The cost of the inventory involved in the transaction is $800.

Transaction #5: Sunshine publishers records depreciation expense of $900.

Transaction #6: Sunshine publishers determines that their one press is becoming obsolete, and determine they need to write-down (i.e. reduce) its book value by $12,000.