Taxes – Forex Losses in an LLC that conducts other business?

kirkhilles asked: Hi, I have an LLC that performs 2 primary activities:
1) Consulting/Software Development Work
2) Automated Forex (currency) trading
Lets say (for example) that I made $40,000 doing the Consulting work and LOST $20,000 doing the Forex Trading.
Can I fully write-off that $20,000 loss and only pay taxes on the $20,000 net? If so, what documentation [...]