1. **State the problem:** Calculate the sum of 69, 6875, and 799. 2. **Formula used:** For addition of numbers, the formula is simply $$a + b + c$$ where $a$, $b$, and $c$ are the numbers to add. 3. **Apply the formula:** $$69 + 6875 + 799$$ 4. **Perform the addition step-by-step:** First, add 69 and 6875: $$69 + 6875 = 6944$$ Then add 799 to the result: $$6944 + 799 = 7743$$ 5. **Final answer:** The sum of 69, 6875, and 799 is $$7743$$.