Find all pairs of $(x, y)$ of positive integers such that $2x + 7y$ divides $7x + 2y$.
1. We start with the given condition that \(2x + 7y\) divides \(7x + 2y\). This can be written as:
   \[
   k(2x + 7y) = 7x + 2y
   \]
   for some positive integer \(k\).

2. Expanding and rearranging the equation, we get:
   \[
   k(2x + 7y) = 7x + 2y \implies 2kx + 7ky = 7x + 2y
   \]
   \[
   2kx - 7x = 2y - 7ky
   \]
   \[
   (2k - 7)x = (2 - 7k)y
   \]

3. Since \(x\) and \(y\) are positive integers, the coefficients of \(x\) and \(y\) must be such that both sides of the equation are positive integers. This implies that both \(2k - 7\) and \(2 - 7k\) must be integers.

4. We need to find values of \(k\) such that both \(2k - 7\) and \(2 - 7k\) are positive integers. Let's analyze the possible values of \(k\):

   - For \(2k - 7 > 0\):
     \[
     2k > 7 \implies k > \frac{7}{2} \implies k \geq 4
     \]

   - For \(2 - 7k > 0\):
     \[
     2 > 7k \implies k < \frac{2}{7} \implies k = 0 \text{ (since } k \text{ must be a positive integer)}
     \]

   However, \(k = 0\) is not a positive integer. Therefore, we need to find values of \(k\) that satisfy both conditions.

5. We test the values \(k = 1, 2, 3\) as suggested in the solution:

   - For \(k = 1\):
     \[
     (2 \cdot 1 - 7)x = (2 - 7 \cdot 1)y \implies -5x = -5y \implies x = y
     \]
     This gives the solution \((x, y) = (a, a)\) for any positive integer \(a\).

   - For \(k = 2\):
     \[
     (2 \cdot 2 - 7)x = (2 - 7 \cdot 2)y \implies -3x = -12y \implies x = 4y
     \]
     This gives the solution \((x, y) = (4a, a)\) for any positive integer \(a\).

   - For \(k = 3\):
     \[
     (2 \cdot 3 - 7)x = (2 - 7 \cdot 3)y \implies -x = -19y \implies x = 19y
     \]
     This gives the solution \((x, y) = (19a, a)\) for any positive integer \(a\).

6. Therefore, the solutions are:
   \[
   \boxed{(x, y) = (a, a), (4a, a), (19a, a) \text{ for any positive integer } a}
   \]