The given equation seems incomplete. You likely meant to write:

\[ 3 + x = 15 \]

If that's the case, I can solve it as follows:

\[
3 + x = 15
\]

Subtract 3 from both sides:

\[
x = 15 - 3
\]

\[
x = 12
\]

So, \( x = 12 \).

Let me know if you meant something different! Do you need more details on the steps or clarification?

Here are five related questions:

1. How would you solve \( 4 + x = 20 \)?
2. What happens if you add a negative number to both sides of an equation?
3. How do you solve \( 3 + 2x = 15 \)?
4. Can you solve \( 3 - x = 15 \)?
5. How do you solve equations involving fractions?

**Tip:** When solving linear equations, always perform the same operation on both sides to maintain balance!

Learn how to solve the simple linear equation 3 + x = 15 with a detailed step-by-step solution. This problem covers fundamental algebra concepts, focusing on solving for x by isolating the variable. Suitable for students in Grades 6-7.

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