To determine which rational expressions can be simplified, we need to look for any common factors in the numerator and denominator.
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Option 1: \( \frac{7x}{5x+7} \)
In this expression, the numerator is \( 7x \) and the denominator is \( 5x + 7 \). There are no common factors in the numerator and the denominator (since \( 5x + 7 \) cannot be factored and \( 7x \) does not share any factors with it). Thus, this expression cannot be simplified.
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Option 2: (please provide the expression)
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Option 3: (please provide the expression)
Please provide the expressions for Options 2 and 3 so I can assist you further in determining if they can be simplified.