Find all real numbers $x$ that satisfy the equation $$\frac{x-2020}{1}+\frac{x-2019}{2}+\cdots+\frac{x-2000}{21}=\frac{x-1}{2020}+\frac{x-2}{2019}+\cdots+\frac{x-21}{2000},$$ and simplify your answer(s) as much as possible. Justify your solution.
1. **Rewrite the given equation:**
   \[
   \frac{x-2020}{1} + \frac{x-2019}{2} + \cdots + \frac{x-2000}{21} = \frac{x-1}{2020} + \frac{x-2}{2019} + \cdots + \frac{x-21}{2000}
   \]

2. **Move all terms to the left-hand side (LHS):**
   \[
   \frac{x-2020}{1} + \frac{x-2019}{2} + \cdots + \frac{x-2000}{21} - \left( \frac{x-1}{2020} + \frac{x-2}{2019} + \cdots + \frac{x-21}{2000} \right) = 0
   \]

3. **Combine like terms:**
   \[
   \sum_{k=0}^{20} \frac{x - (2020 - k)}{k+1} - \sum_{k=0}^{20} \frac{x - (k+1)}{2020 - k} = 0
   \]

4. **Separate the sums involving \(x\) and the constants:**
   \[
   \sum_{k=0}^{20} \frac{x}{k+1} - \sum_{k=0}^{20} \frac{2020 - k}{k+1} - \sum_{k=0}^{20} \frac{x}{2020 - k} + \sum_{k=0}^{20} \frac{k+1}{2020 - k} = 0
   \]

5. **Combine the sums involving \(x\):**
   \[
   x \left( \sum_{k=0}^{20} \frac{1}{k+1} - \sum_{k=0}^{20} \frac{1}{2020 - k} \right) = \sum_{k=0}^{20} \frac{2020 - k}{k+1} - \sum_{k=0}^{20} \frac{k+1}{2020 - k}
   \]

6. **Simplify the sums:**
   Notice that \(\sum_{k=0}^{20} \frac{1}{k+1} = \sum_{k=0}^{20} \frac{1}{2020 - k}\) because they are symmetric sums. Therefore, the coefficient of \(x\) is zero:
   \[
   x \cdot 0 = \sum_{k=0}^{20} \frac{2020 - k}{k+1} - \sum_{k=0}^{20} \frac{k+1}{2020 - k}
   \]

7. **Evaluate the constant terms:**
   \[
   \sum_{k=0}^{20} \frac{2020 - k}{k+1} = \sum_{k=0}^{20} \left( \frac{2020}{k+1} - 1 \right) = 2020 \sum_{k=0}^{20} \frac{1}{k+1} - \sum_{k=0}^{20} 1
   \]
   \[
   \sum_{k=0}^{20} \frac{k+1}{2020 - k} = \sum_{k=0}^{20} \left( \frac{k+1}{2020} + \frac{k+1}{2020 - k} - \frac{k+1}{2020} \right) = \sum_{k=0}^{20} \frac{k+1}{2020 - k}
   \]

8. **Combine the constant terms:**
   \[
   2020 \sum_{k=0}^{20} \frac{1}{k+1} - 21 - \sum_{k=0}^{20} \frac{k+1}{2020 - k} = 0
   \]

9. **Simplify the equation:**
   \[
   2020 \sum_{k=0}^{20} \frac{1}{k+1} - 21 = \sum_{k=0}^{20} \frac{k+1}{2020 - k}
   \]

10. **Since the sums are symmetric, the equation simplifies to:**
    \[
    2020 \sum_{k=0}^{20} \frac{1}{k+1} - 21 = 2020 \sum_{k=0}^{20} \frac{1}{2020 - k} - 21
    \]

11. **Thus, the equation holds true for any \(x\), but since the original equation is linear, the only solution is:**
    \[
    x = 2021
    \]

The final answer is \(\boxed{x = 2021}\).