Vertical angles are angles opposite each other when two lines cross. They are always equal in measure. Thus, if angle A is 72 degrees and angle B is \(3x + 6\), we can set up the equation:
\[ 72 = 3x + 6 \]
Now, let's solve for \(x\).
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Subtract 6 from both sides: \[ 72 - 6 = 3x \] \[ 66 = 3x \]
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Divide both sides by 3: \[ x = \frac{66}{3} \] \[ x = 22 \]
So the value of \(x\) is \(22\).