To solve the proportion $$\frac{7}{x} = \frac{21}{63}$$ , cr...

Question Analysis
This question tests the student's ability to use cross-multiplication to solve a proportion. The given proportion is .

Key Concept Explanation
Cross-multiplication involves multiplying the numerator of one fraction by the denominator of the other and setting the products equal. This method transforms the proportion into a simple equation.

Step-by-step Solution
1. Start with the given proportion:
2. Cross-multiply:

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Algebra-1

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