You put $$$$7,000$ in an account earning $6\%.$ After $3$years$,$ you make another deposit into the same account. Four years later$($that is$,7$ years after your original $$$$7,000$deposit$),$ the account balance is $$$$22,000.$ What was the amount of the deposit at the end of year $3?$

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Part $1$

The amount of the deposit at the end of year $3$ is $$$