To factor the expression \( \frac{21x}{2} + \frac{3xz}{2} \), we can follow these steps:
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Factor out the common term: Both terms have a common factor of \( \frac{3x}{2} \).
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Rewrite the expression: \[ \frac{21x}{2} + \frac{3xz}{2} = \frac{3x}{2} \cdot 7 + \frac{3x}{2} \cdot z \]
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Factor out \( \frac{3x}{2} \): \[ = \frac{3x}{2} (7 + z) \]
So the factored form of the expression \( \frac{21x}{2} + \frac{3xz}{2} \) is:
\[ \frac{3x}{2} (7 + z) \]