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The question is asking which of the following rules in simplifying rational expressions is **true**, and the options are:

1. **Find the GCF of both numerators and denominators.**
   - This is a general step in factoring but not specifically a rule for simplification.

2. **Multiply the whole expression by the LCD.**
   - This applies more to addition or subtraction of rational expressions, not simplification.

3. **Identify the reciprocal of the divisor.**
   - This applies in division of rational expressions, but not directly to simplification.

4. **Identify the value of the variable that will make the expression undefined.** (This is selected)
   - This is a critical step in simplifying rational expressions because a rational expression becomes undefined when the denominator

Which of the following rules in simplifying rational expressions is TRUE?

Discover the process of simplifying rational expressions by identifying the variable values that make the expression undefined. This problem focuses on rational expressions and how to avoid division by zero, suitable for students in Grades 8-10.

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