Find the inverse matrix, if one exists. 
Definitions:
FICA-OASDI
The Federal Insurance Contributions Act - Old-Age, Survivors, and Disability Insurance, a payroll tax that funds Social Security and Medicare in the United States.
Federal Income Tax
A tax levied by the United States federal government on the annual earnings of individuals, corporations, trusts, and other legal entities.
Net Earnings
The amount of profit that remains after all operating expenses, taxes, interest, and preferred stock dividends have been deducted from total revenue.
Hourly Rate
A rate of pay based on one hour of work, often used to compensate temporary, part-time, or freelance employees.
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