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To solve this circuit using the **superposition principle**, we will analyze the contribution of each independent voltage source separately while ignoring the other. Afterward, we will sum the contributions from both sources to find the total voltage across \( v_x \).

### Step-by-Step Solution:

1. **Deactivate the 18 V source**:
    - We first deactivate the 18 V source, which means we replace it with a short circuit.
    - Now, only the 6 V source is active.

2. **Solve for \( v_{x1} \) due to 6 V source**:
    - The 6 V source is now the only source, and the circuit simplifies. We can calculate the current through the 2-ohm and 4-ohm resistors using mesh or nodal analysis.

3. **Deactivate the 6 V source**:
    - Now, deactivate the 6 V source, which means replacing it with a short circuit.
    - Analyze the circuit with only the 18 V source active.

4. **Solve for \( v_{x2} \) due to 18 V source**:
    - Use mesh or nodal analysis to find the contribution of the 18 V source to \( v_x \).

5. **Sum the contributions**:
    - The total voltage \( v_x \) is the sum of the contributions from both sources:  
    \[
    v_x = v_{x1} + v_{x2}
    \]

Once we complete these steps, we will have \( v_x \).

Would you like to go over each part of the superposition analysis in detail for this circuit?

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Here are some questions that expand on the above solution:

1. How does the superposition principle simplify complex circuits?
2. How do you handle dependent sources like the one in the circuit (0.25 \( v_x \)) when applying the superposition principle?
3. What happens to the behavior of the circuit when one of the sources is turned off?
4. How would the method change if there was an additional current source instead of another voltage source?
5. How can we apply Kirchhoff's laws to this specific circuit for further analysis?

**Tip:** Always deactivate sources by replacing voltage sources with short circuits and current sources with open circuits when using superposition!

Analyze a circuit containing dependent and independent voltage sources using the superposition principle. Learn how to calculate v_x by deactivating sources and applying Kirchhoff's laws.

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