To solve the equation 198 - (x + 4) = 120, we need to isolate the variable x.

First, let's simplify the equation by removing the parentheses:

198 - x - 4 = 120

Next, combine like terms:

194 - x = 120

To isolate x, we need to get rid of the constant term on the left side of the equation. We can do this by subtracting 194 from both sides:

- x = 120 - 194

Simplifying further:

- x = -74

Finally, to solve for x, we need to multiply both sides of the equation by -1 to get rid of the negative sign:

x = -1 * (-74)

x = 74

Therefore, the solution to the equation 198 - (x + 4) = 120 is x = 74.