Step 1: Solve the given system of equations.
By solving the system of equations using basic algebraic methods, the value of \( x \) is found to be \( x = \alpha + \beta + \gamma \).
Step 2: Conclusion.
Thus, the value of \( x \) is \( \alpha + \beta + \gamma \).
Final Answer:
\[
\boxed{x = \alpha + \beta + \gamma}
\]