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Since the uploaded image contains a supply and demand problem related to "Samfunnsøkonomisk overskudd og markedslikevekt" (social surplus and market equilibrium), let's break down the given information.

You are provided with two equations:

1. **Demand curve (etterspørsel)**:  
   \[
   p = 30 - x
   \]
   where \( p \) is the price and \( x \) is the quantity demanded.

2. **Supply curve (tilbudskurve)**:  
   \[
   p = 5 + 0.25x
   \]
   where \( p \) is the price and \( x \) is the quantity supplied.

### Finding the Market Equilibrium:
The market equilibrium is found by setting the supply equal to the demand:
\[
30 - x = 5 + 0.25x
\]

### Solving for \( x \):
Let's solve this step by step.

\[
30 - 5 = x + 0.25x
\]
\[
25 = 1.25x
\]
\[
x = \frac{25}{1.25} = 20
\]

So, the equilibrium quantity \( x_E \) is 20 units.

### Finding the Equilibrium Price:
Now, substitute \( x = 20 \) into either the demand or supply equation to find the equilibrium price \( p_E \). Using the demand equation:
\[
p = 30 - 20 = 10
\]

Thus, the equilibrium price \( p_E \) is 10.

### Interpreting the Graph:
The green downward-sloping line is the demand curve, and the blue upward-sloping line is the supply curve. They intersect at the equilibrium point, where the price is 10 and the quantity is 20.

Would you like further clarification or details on the next steps?

Here are 5 related questions to expand on:

1. How does the government intervention with a tax of 5 kroner affect the new equilibrium?
2. What is the consumer surplus before and after the tax?
3. How is producer surplus calculated in this scenario, and how does it change due to the tax?
4. Can we calculate the deadweight loss due to the government tax?
5. How would an increase in the tax rate impact the market equilibrium and social welfare?

**Tip:** Always visualize changes in supply and demand by adjusting the curves in the graph.

This problem involves solving for market equilibrium using a demand curve p = 30 - x and a supply curve p = 5 + 0.25x. Learn how to calculate the equilibrium price and quantity step-by-step. Suitable for high school students.

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