b) \( \frac{x}{5}=0,8 \)

To solve the equation \( \frac{x}{5}=0,8 \), we can multiply both sides by 5. This gives us \( x = 0,8 \times 5 \). Performing the multiplication, we find that \( x = 4 \). So the solution to the equation is \( x = 4 \). Fun fact: In mathematics, the concept of solving equations dates back to ancient civilizations like the Babylonians, who used algebraic methods to solve problems involving land measurement and trade. These early mathematicians laid the groundwork for the algebra we use today! If you ever find yourself stuck with similar equations, remember that isolating your variable is key. A common mistake is forgetting to perform the same operation on both sides of the equation, which can lead to incorrect solutions. Just like balancing a seesaw, what you do on one side must be mirrored on the other!