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The image contains a mathematical exercise in Serbian that asks for the calculation of unknown lengths (denoted as \( x \)) from different geometric configurations. Here's the breakdown of each part:

### Problem 39: Calculate the unknown length \( x \) from the diagram, given:

#### a) 
\( AD = 12 \, \text{cm}, \, DB = 4 \, \text{cm}, \, AE = 18 \, \text{cm}, \, EC = x \)

#### b) 
\( AD = 8 \, \text{cm}, \, AE = 12 \, \text{cm}, \, AB = 5 \, \text{cm}, \, BC = x \)

#### c) 
\( AB = 7 \, \text{cm}, \, BC = 3.5 \, \text{cm}, \, AD = 2 \, \text{cm}, \, DE = x \)

#### d)
\( AB = 9 \, \text{cm}, \, EC = 4 \, \text{cm}, \, BC = 3 \, \text{cm}, \, DB = x \)

Would you like to go through each of these in detail and solve them step by step?

### Questions for Further Thought:
1. How do the different segments relate to each other geometrically (e.g., are they part of triangles, trapezoids)?
2. What method can we use to solve for \( x \) (e.g., segment addition, Pythagoras theorem, similarity)?
3. Are there any specific properties of triangles or polygons being used in these problems?
4. How can we verify if the calculated length \( x \) makes sense in each case?
5. What would happen if any of the known lengths were altered? How would that affect \( x \)?

### Tip:
In geometry problems, always identify whether the figures are triangles, quadrilaterals, or other polygons, as this will help in deciding the correct method for solving.

Izračunaj dužinu nepoznate duži x sa slike ako je:

 a) AD = 12 cm, DB = 4 cm, AE = 18 cm, EC = x
 b) AD = 8 cm, AE = 12 cm, AB = 5 cm, BC = x
 c) AB = 7 cm, BC = 3.5 cm, AD = 2 cm, DE = x
 d) AB = 9 cm, EC = 4 cm, BC = 3 cm, DB = x

In this problem, solve for the unknown length x using segment addition in various geometric configurations. We will break down each case step by step and apply the segment addition formula. Suitable for Grades 7-9.

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