Let's represent the unknown number as \( x \). The problem states that a number decreased by 15 is 19, which can be written as the equation:

\[
x - 15 = 19
\]

To solve for \( x \), add 15 to both sides of the equation:

\[
x = 19 + 15
\]

\[
x = 34
\]

Thus, the number is 34.

Would you like more details or have any questions about this? 

Here are 5 related questions:
1. What would the number be if it were decreased by 20 instead of 15?
2. What is the result if 34 is decreased by 25?
3. How would you solve for \( x \) if the number increased by 15 equals 50?
4. Can you set up a similar equation where a number decreased by 10 equals 5?
5. How would the equation change if the number was divided by 3 instead of being decreased by 15?

**Tip:** When solving equations, always aim to isolate the variable by performing inverse operations!

Learn how to solve the linear equation where a number decreased by 15 equals 19. This problem introduces algebraic concepts such as isolating the variable to find the unknown number, and is suitable for students in Grades 6-7.

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