A proportion is an equation stating that two ratios are equa...

Question Analysis
This question tests the student's understanding of the definition of a proportion and the application of the cross-multiplication rule to solve for an unknown variable.

Key Concept Explanation
The key concept here is the cross-multiplication rule, which states that in a proportion, the product of the means equals the product of the extremes.

Step-by-step Solution
1. Write down the given proportion:
2. Apply the cross-multiplication rule:
3. Simplify the equation:

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Algebra-1

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