To get rid of the \(-10f\) on the right side of the equation \(22f - 12 = -10f - 8\) and keep the equation balanced, you should add \(10f\) to both sides of the equation.
This will give you:
\[ 22f + 10f - 12 = -10f + 10f - 8 \]
Which simplifies to:
\[ 32f - 12 = -8 \]
Now you have all \(f\) terms on the left side of the equation.