To solve the equation \( x - 3.41 = -19 \) for \( x \), you want to isolate \( x \). You can do this by adding \( 3.41 \) to both sides of the equation.
So, the correct operation to perform on both sides is:
Add 3.41.
This will give you:
\[ x - 3.41 + 3.41 = -19 + 3.41 \]
which simplifies to:
\[ x = -15.59 \].