1. **State the problem:** Solve the equation $$m = \frac{a}{D - 5H}$$ for the variable $$a$$. 2. **Formula and rules:** To isolate $$a$$, multiply both sides of the equation by the denominator $$D - 5H$$ to cancel the fraction. 3. **Multiply both sides:** $$m \times (D - 5H) = \frac{a}{D - 5H} \times (D - 5H)$$ 4. **Cancel the denominator:** $$m \times (D - 5H) = \cancel{\frac{a}{D - 5H}} \times \cancel{(D - 5H)}$$ 5. **Simplify:** $$a = m(D - 5H)$$ 6. **Final answer:** $$\boxed{a = m(D - 5H)}$$ This means $$a$$ equals $$m$$ multiplied by the quantity $$D - 5H$$.