1. **State the problem:** Solve for $s$ in the equation $$\frac{s}{-15} + 215 = 240$$. 2. **Isolate the term with $s$:** Subtract 215 from both sides to get $$\frac{s}{-15} = 240 - 215$$. 3. **Simplify the right side:** $$\frac{s}{-15} = 25$$. 4. **Solve for $s$ by multiplying both sides by $-15$:** $$s = 25 \times (-15)$$ 5. **Calculate the product:** $$s = -375$$. **Final answer:** $$s = -375$$.