1. **State the problem:** Solve for $r$ in the equation $$4r - 3r = 20$$. 2. **Combine like terms:** Since both terms on the left side contain $r$, subtract the coefficients: $$4r - 3r = (4 - 3)r = 1r = r$$ 3. **Rewrite the equation:** $$r = 20$$ 4. **Conclusion:** The value of $r$ that satisfies the equation is: $$\boxed{20}$$