Find all triplets of real numbers $(x, y, z)$ that satisfies the system of equations
$x^5 = 2y^3 + y - 2$
$y^5 = 2z^3 + z - 2$
$z^5 = 2x^3 + x - 2$
1. **Define the function and its properties:**
   Let \( \varphi(t) = 2t^3 + t - 2 \). We need to show that \( \varphi(t) \) is strictly increasing. To do this, we compute its derivative:
   \[
   \varphi'(t) = 6t^2 + 1
   \]
   Since \( 6t^2 + 1 > 0 \) for all \( t \in \mathbb{R} \), \( \varphi(t) \) is strictly increasing.

2. **Equating the functions:**
   Given the system of equations:
   \[
   x^5 = 2y^3 + y - 2
   \]
   \[
   y^5 = 2z^3 + z - 2
   \]
   \[
   z^5 = 2x^3 + x - 2
   \]
   We observe that if \( x = y = z \), then each equation reduces to:
   \[
   t^5 = 2t^3 + t - 2
   \]
   Therefore, any real root \( r \) of the equation \( t^5 = 2t^3 + t - 2 \) will satisfy \( (r, r, r) \).

3. **Uniqueness of the solution:**
   Assume \( x = \max\{x, y, z\} \). Then \( x \ge z \) implies \( x^5 \ge z^5 \). Since \( t^5 \) is strictly increasing, we have:
   \[
   2y^3 + y - 2 \ge 2x^3 + x - 2
   \]
   Since \( \varphi(t) = 2t^3 + t - 2 \) is strictly increasing, it follows that:
   \[
   y \ge x
   \]
   Thus, \( x = y \). Similarly, by considering \( y = \max\{x, y, z\} \) and \( z = \max\{x, y, z\} \), we can show that \( y = z \) and \( z = x \). Therefore, \( x = y = z \).

4. **Conclusion:**
   The only solutions to the system are of the form \( (r, r, r) \), where \( r \) is a real root of the polynomial equation \( t^5 = 2t^3 + t - 2 \).

The final answer is \( \boxed{ (r, r, r) } \) where \( r \) is a real root of \( t^5 = 2t^3 + t - 2 \).