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Assuming those are denominators of fractions you wish to add or subtract, you can use any common multiple of 4 and 14; the Lowest Common Multiple (LCM), often called the Lowest Common Denominator (LCD) especially when when referring to the denominators of fraction, provides the smallest numerators.

For 4 and 14, the LCM is 28.

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Q: What is the common denominator of 4 and 14?
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