1. **State the problem:** We need to subtract the integer 7 from -15, which is written as $-15 - 7$. 2. **Understand subtraction of integers:** Subtracting a positive number is the same as adding its negative. So, $-15 - 7$ can be rewritten as $-15 + (-7)$. 3. **Perform the addition:** Adding two negative numbers means we add their absolute values and keep the negative sign. $$-15 + (-7) = -(15 + 7) = -22$$ 4. **Final answer:** The result of $-15 - 7$ is $-22$.