The image shows a straight angle, with two angles labeled: one is $153^\circ$ and the other is $(x - 3)^\circ$. These two angles form a linear pair, meaning they are supplementary, and their sum must equal $180^\circ$.

Let's solve for $x$:

$153^\circ + (x - 3)^\circ = 180^\circ$

Simplifying the equation:

$153 + x - 3 = 180$

$150 + x = 180$

$x = 180 - 150$

$x = 30$

Thus, the value of $x$ is $30^\circ$.

Would you like further details on this solution?

Here are some related questions:

1. What are supplementary angles?
2. Can angles in a triangle also be supplementary?
3. How do linear pairs help in solving for unknown angles?
4. What would happen if the angle sum exceeded $180^\circ$ in such cases?
5. How can we use algebra in geometry to solve angle problems?

Tip: When working with linear pairs, always remember that their sum is $180^\circ$, as they form a straight line.