To find the value of \( x \), we start with the given information:
- Angles 1 and 3 are vertical angles.
- \( m∠1 = (4x + 26)° \)
- \( m∠3 = 98° \)
Since vertical angles are equal, we can set up the equation:
\[ 4x + 26 = 98 \]
Now, we can solve for \( x \):
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Subtract 26 from both sides: \[ 4x = 98 - 26 \] \[ 4x = 72 \]
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Divide both sides by 4: \[ x = \frac{72}{4} = 18 \]
Thus, the value of \( x \) is \( \boxed{18} \).