Solve for x given the following equation involving a determinant. 
Definitions:
Compounding Interval
The frequency at which interest is added to the principal amount of an investment or loan, influencing the total amount of interest earned or paid.
Compounded Semi-Annually
The calculation of interest on a principal sum twice a year, effectively increasing the amount on which future semi-annual interest payments are calculated.
Annuity
An investment vehicle that delivers a steady flow of payments to a recipient, predominantly designed to be a revenue stream for retired persons.
Compounded Semi-Annually
The process of calculating interest on both the initial principal and the accumulated interest from previous periods on a semi-annual basis.
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