Solve the differential equation using the method of variation of parameters. 
Definitions:
Journal
An accounting record where all business transactions are initially recorded in chronological order.
Book of Original Entry
The first place where financial transactions are recorded, including journals.
Journal Entry
A record in accounting that documents a business transaction, showing the accounts impacted and the amounts debited and credited.
Debit Account
A bookkeeping record that raises the value of an asset or expense, or lowers the value of a liability or equity.
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