Solve the system of linear equations by elimination. 
Definitions:
Reserves
Assets held by a financial institution or an individual as a buffer for potential future liabilities or emergencies.
Leverage
The use of borrowed money to supplement existing funds for purposes of investment.
Bank Investments
Financial assets purchased or held by banks, including bonds, stocks, real estate, and other securities, with the aim of generating income or capital appreciation.
Leverage Ratio
The ratio of assets to bank capital.
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