Find all solutions to the following equation. 
Definitions:
Gold Futures
Contracts for the future delivery of gold at a specified price, used for hedging and investing purposes.
Arbitrage Profit
The profit made from buying and selling equivalent financial instruments or capitalizing on price differences in different markets to generate a risk-free return.
Risk-free Rate
The theoretical rate of return of an investment with zero risk, typically associated with government bonds.
Swap Market
A marketplace where parties exchange financial instruments, such as interest rates or currencies.
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