Step 1: Identify the relationship between the angles
The given angles are vertical angles, which means they are equal. Therefore, we can set up the equation:
\[ 6x + 7 = 8x - 17 \]
Step 2: Solve for \( x \)
First, isolate \( x \) by moving all \( x \)-terms to one side and constants to the other side:
\[ 6x + 7 = 8x - 17 \]
Subtract \( 6x \) from both sides:
\[ 7 = 2x - 17 \]
Add 17 to both sides:
\[ 24 = 2x \]
Divide both sides by 2:
\[ x = 12 \]