Since ∠1 and ∠3 are a vertical pair, they are equal in measure. Thus, we can set up the following equation:
\[ m∠1 = m∠3 \] \[ 4x + 26 = 98 \]
Now, let's 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: \[ x = \frac{72}{4} \] \[ x = 18 \]
So, the value of \( x \) is 18.