Just for kicks, I entered your info into a weight loss calculator and it shows:
to lose 75 lbs in 6 months---
Your goal is to lose 75 lb / 34 kg for 180 days.
To maintain your current weight, your safe daily calories intake is around 3365 calories
To reach your goal, you will need to consume 1895 calories daily.
I'd go with that 1985/day number if 1500 is too low (which it was for me when I tried a couple months back).