To solve the equation \( 2x = 20 \), we first isolate \( x \) by dividing both sides by 2:
\[ x = \frac{20}{2} = 10 \]
Now, we can express the solution in set notation. The solution set containing the value that satisfies the equation is:
\[ { 10 } \]
So the final answer in set notation is:
\[ { 10 } \]