To solve for \( x \) in the equation \( 13x + 26 = 3x - 34 \), we will first isolate \( x \).
- Subtract \( 3x \) from both sides:
\[ 13x - 3x + 26 = -34 \]
This simplifies to:
\[ 10x + 26 = -34 \]
- Now, subtract \( 26 \) from both sides:
\[ 10x = -34 - 26 \]
This simplifies to:
\[ 10x = -60 \]
- Finally, divide both sides by \( 10 \):
\[ x = -6 \]
The solution is \( x = -6 \).
Thus, the answer is \( \boxed{-6} \).