1. **State the problem:** Rearrange the equation $$cq - u = h$$ to make $$q$$ the subject. 2. **Add $$u$$ to both sides:** $$cq - u + u = h + u$$ which simplifies to $$cq = h + u$$ 3. **Divide both sides by $$c$$ to isolate $$q$$:** $$q = \frac{h + u}{c}$$ 4. **Final answer:** $$q = \frac{h + u}{c}$$ This means $$q$$ is expressed in terms of $$h$$, $$u$$, and $$c$$ by dividing the sum of $$h$$ and $$u$$ by $$c$$.