To solve the equation \( 2x = 20 \), we first isolate \( x \) by dividing both sides by 2:
\[ x = \frac{20}{2} = 10 \]
The value that satisfies the equation is \( x = 10 \).
In set notation, this can be expressed as:
\[ {10} \]
Thus, the answer is \( {10} \).